The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Jule Körner's house full of bizarre architectural details.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

Garden dedicated to native carnivorous plants and site of huge flytrap heist.

A piece of outsider public art accompanied by a strange urban legend.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

A historic covered bridge, only one of two remaining in North Carolina.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

The 15-foot-wide, 2-ton pan fries hundreds of chickens once a year.

Perhaps the oldest vine in North America, this sprawling plant helps make a sweet wine.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

A sculptor's dream castle turned fantastical ruin.

A beautiful riverside mansion where the intellectual life of early-20th-century Argentina flourished.

The humble tomb of an Argentine general, hand-built by his son using stones brought down from the Andes.

The narrowest house in Buenos Aires is less than 10 feet wide.

A gateway to a mysterious network of underground tunnels.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

From lefty Jewish gathering site to hip cultural site in just 80 years.

This indiscriminate collection of audio antiques is trying to preserve the history of the audio industry one vintage appliance at a time.

A historic Montreal market that was the city's agricultural hub for over century.