The shared home of a utopian commune that practiced "free love" a century before the hippies.

Possibly the smallest church in the world floats in the middle of a pond.

An interesting look into 18th-century American history.

This elaborate High Victorian Gothic structure is one of the world's few 16-sided buildings.

This former railroad bridge was named after the great river that once flowed below it.

This former sugarcane transport tunnel is now a portal to a lovely beach.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

Many of the murals covering this sleepy Florida town hide some sort of intentional error.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The last street in Pittsburgh that's paved with wood.

This spot memorializes one of the greatest plays in NFL history, unless you happen to be a Raiders fan.

The legacy of baseball great Roberto Clemente is preserved in a retired Pittsburgh fire station.

This railroad and oil tycoon's lavish estate now stands as a time capsule of the Gilded Age.

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

A park where people have been going to feed friendly pigeons since the 18th century

This tiny home was originally a narrow alleyway.

Archaeological sites and great food inside the island's largest mangrove forest.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

These red and black houses were awarded to the firefighters who saved their city from an enormous blaze.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

This small fort played a huge role defending Puerto Rico’s capital city.

This colorful gate stands as an entrance to the walled city of Old San Juan.