An 18th-century Spanish watchtower made entirely of seashell and concrete.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

A white oak with property rights.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

Yo, Adrian!

A man's home is his castle.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

“Invented in Key West, Perfected in Brooklyn."

Mai Tais and Navy Grog served up in one of the original tiki bars.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.

A bit of retro transportation flair preserved in the world's largest department store.

The first and only carousel with a lineup entirely of insects.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

Detailed facade of a brownstone in Boerum Hill.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

The highest point in Virginia can only be reached by passing through ponies and flowers.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

From scholastic to sepulchral - now under reconstruction.