A surprising, but overlooked example of geology in the middle of the nation’s capital.

The "world’s largest honky-tonk" also has its own indoor rodeo arena.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

Art Deco stylings conceal the true nature of this bridge.

A prestigious learning institute of old Shanghai.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

This strategically-placed fountain creates the magnificent illusion of mustangs galloping across a river.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

The highway's southernmost spot is a beloved local attraction.

Claude Monet was baptized in this lavishly ornate Paris church.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

A serene temple with stunning stained glass hides in downtown Dallas.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

An ornate private entrance to the Vienna subway built specifically for the emperor.

This unassuming passageway played a key role in one of the most important events in U.S. history.

A secret greenspace hides atop a Capitol parking garage.

Its collection includes a broad array of social, geographic, graphic design, and political history.