Rome's semi-secret peephole vista is also a former Crusader stronghold.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A huge musical instrument played by the ocean.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

One of the most powerful computers in the world can be visited by anyone who wants to experience more computing than they can handle.

This bridge was constructed from the remains of the first Ferris wheel.

A modernist landscape of water and sci-fi concrete.

An emerald-green grotto just a short trip from Austin.

Some islands... they come, they go, especially on Lake Travis.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

A hot dog stand where the heads are just as hot as the dogs.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Partially submerged Buddha heads freckle Chicago’s neighborhoods.

Honoring Italian greats from Joe DiMaggio to Rocky Marciano.

A 19th-century horse lover's bequest led to the construction of this unique fountain in Chicago.

A Japanese temple, old German townhouses, and public chess tables offer a peaceful escape from the bustle of the North Side.

This titanic Catholic church in Chicago is also a refuge of the fictional cult-favorite wizard detective Harry Dresden.

Huge abstract sculptures of the Puerto Rican Flag.

One of the few remaining relics of the meatpacking hub that made Chicago the "hog butcher to the world."

In a quiet north Chicago neighborhood rests a stunning relic of the golden age of earthenware design.