The world’s largest underground marble quarry is hiding in Vermont.

A Tucson museum and performance space full of found-object movable sculptures.

This giant steer-skull edifice refuses to die.

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

The world's largest military aircraft cemetery.

An urban laboratory.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

Relics from as far back as the 16th century are on display in a city known for its playing card industry.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Microscopic scenes; some call it novelty, some call it art.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

A Jenga-style cylindrical tower of books that appears to go on forever.

Two stunning 17th-century libraries and a cabinet of curiosities.

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

A boardwalk winds above this beautiful bog full of wildlife and a rare type of turtle.

More than 200 unconventional musical instruments that anyone can play.

This old mill and former police station now present a world-class collection of Orthodox iconography.

This Dutch-styled residential building was originally a cocoa company's World's Fair showpiece.

The mansion home of author Edith Wharton.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

This rare symbol of Eastern philosophy in the West has been created over years of painstaking construction by the local community.