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The St. Augustine Shipwreck Museum & Gallery near the old town's bayfront shows artefacts from shipwrecks off Florida and around the world, including finds from the Spanish galleon Nuestra Señora de Atocha and objects linked to the Titanic. Exhibits explain how wrecks are located, salvaged and conserved.

The Bridge of Lions is a double-leaf bascule bridge of 1927 that carries the Mediterranean Revival style across Matanzas Bay, from the old town's Plaza to Anastasia Island. Two Carrara marble lions guard its western end; it was rebuilt to its original design between 2006 and 2010.

The Medieval Torture Museum at 100 St. George Street, opened in 2020, displays more than 100 replicas and originals of devices used for punishment and torture in medieval and early modern Europe. Each is shown with an explanation of its use, and the ticket includes an audio guide.

The Cathedral Basilica of St. Augustine, on the north side of the Plaza de la Constitución, is the seat of the Catholic Diocese of St. Augustine. The coquina church was completed in 1797 for the parish founded in 1565, rebuilt after an 1887 fire and given its bell tower then; murals inside depict the parish's history.

The St. Augustine Alligator Farm on Anastasia Island has shown crocodilians since 1893 and is the only zoo to keep all living species of crocodiles, alligators, caimans and gharials. Boardwalks cross a wading-bird rookery, and the park also keeps albino alligators, lemurs and birds.

Flagler College occupies the former Hotel Ponce de Leon, built by Henry Flagler in 1888 and designed by Carrère and Hastings in Spanish Renaissance style, with Tiffany glass and one of the first electric lighting systems in a hotel. Visitors see the courtyard and façades, and the college runs guided tours of the interior.

The Lightner Museum fills the former Hotel Alcazar, built for Henry Flagler in 1888 in Spanish Renaissance Revival style. Chicago publisher Otto Lightner bought it in 1946 for his collection of Gilded Age decorative arts: cut glass, Tiffany lamps, furniture, mechanical music instruments and Victorian curiosities.

Villa Zorayda on King Street was built in 1883 by Franklin Smith as a winter home, a one-tenth-scale reinterpretation of part of the Alhambra in Granada and one of the first buildings in poured concrete mixed with coquina. The museum shows its Moorish Revival rooms and Smith's collection of art and antiquities.

The González–Alvarez House, known as the Oldest House, has stood on St. Francis Street since the early 1700s, a coquina ground floor with a timber upper storey added under British rule. The St. Augustine Historical Society shows it on guided tours together with a museum, a garden and its research library.

Fort Matanzas is a small coquina watchtower fort built by the Spanish in 1740–1742 on Rattlesnake Island to guard the Matanzas Inlet, the southern approach to St. Augustine, about 23 km south of the city. A National Park Service ferry crosses from the visitor centre on Anastasia Island; the grounds have a boardwalk and beach.

The Gateway Arch is a 192-metre stainless-steel arch on the west bank of the Mississippi in St. Louis, built in 1963–1965 to a 1947 design by Eero Saarinen as a monument to the westward expansion of the United States. Small tram cars inside its legs carry visitors to an observation room at the top, and a museum beneath it covers the city's role in that expansion.

The Basilica of Saint Louis, King of France, known as the Old Cathedral, is a Catholic church built in 1831–1834 in Greek Revival style near the St. Louis riverfront. It was the first cathedral west of the Mississippi and was kept when the surrounding blocks were cleared for the Gateway Arch, which now rises behind it. Pope John XXIII made it a basilica in 1961.

The Old Courthouse is a former federal and state courthouse in downtown St. Louis, begun in 1839 in Greek Revival style and given its cast-iron dome in the 1860s. Dred Scott's suit for freedom was heard here in 1847 and 1850. Part of Gateway Arch National Park, it reopened in 2025 after renovation with four museum galleries and restored courtrooms.

Busch Stadium is the baseball stadium of the St. Louis Cardinals in downtown St. Louis, opened in 2006 on part of the site of the previous Busch Stadium. Designed by HOK Sport (now Populous), it seats about 44,400 spectators, and its upper decks look out over the city skyline and the Gateway Arch. Ballpark Village stands beside it.

City Museum is a museum in a former International Shoe Company factory and warehouse in the Washington Avenue Loft District of St. Louis, opened in 1997 by artist Bob Cassilly and Gail Cassilly. Its caves, tunnels, slides and climbing structures are built from salvaged architectural and industrial objects, and the roof has a small Ferris wheel and a school bus.

The Anheuser-Busch Brewery is the company's original brewery in the Soulard area of south St. Louis, where Budweiser has been brewed since the 1870s. The 57-hectare complex of red-brick buildings, among them the Brew House of 1891–1892, is a National Historic Landmark. Guided tours visit the Brew House, the stables of the Clydesdale horses and the finishing cellars.

The Cathedral Basilica of Saint Louis is the Catholic cathedral of the Archdiocese of St. Louis, on Lindell Boulevard in the Central West End. Built from 1907 and dedicated in 1914, it has a Romanesque Revival exterior with a green-tiled dome and two towers. Its interior is covered with mosaics of 41.5 million glass pieces, completed in 1988.

The Missouri Botanical Garden is a botanical garden on Shaw Boulevard in south St. Louis, founded by Henry Shaw and opened in 1859. Its grounds include the Climatron, a geodesic-dome greenhouse from 1960 holding a tropical rainforest, a large Japanese garden with a lake, Victorian gardens and Shaw's 1849 country house; it also keeps a herbarium of over 7.5 million specimens.

The Saint Louis Science Center is a science museum at the south-east corner of Forest Park, which began as the McDonnell Planetarium in 1963. A skybridge over Interstate 64 links the planetarium to the main building, which has more than 700 hands-on exhibits on the earth and life sciences, physics and technology, a dinosaur hall and a five-storey OMNIMAX dome theatre.

The Missouri History Museum is the history museum of the Missouri Historical Society, founded in 1866, at the northern edge of Forest Park in St. Louis. It occupies the Jefferson Memorial Building, completed in 1913 with profits from the 1904 World's Fair, and its exhibitions cover the history of St. Louis and Missouri, including the fair and Charles Lindbergh.