Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

The world’s largest Masonic temple was saved by the White Stripes.

Detroit’s downtown castle is one of the oldest structures in the city.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

Glass and concrete building designed by Albert Kahn.

Berry Gordy Jr.'s old home was the original headquarters of Motown Record Corporation.

This railway-turned-greenway provides a pedestrian link in downtown Detroit and celebrates urban artwork.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

One of Cincinnati's greatest fighters once trained at a now defunct gym in this Over-The-Rhine neighborhood.

Washington's iconic carousel has a nice piece of Civil Rights history.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The site of the climactic scene from the classic horror film is now a historic landmark.

The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

The magic's in the hole!

Portlandia is the second-largest copper repoussé statue in the United States.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

Mexican food and folk art.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This simple roadside art installation ended up sparking a folk art movement and a controversy of international proportions.