Two New York rooftops are home to the largest rooftop soil farms in the world.

Huge hole looks down onto an underground beach populated with sea lions.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Nature took her revenge on the "Wickedest City in the World."

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

The plague quarantine island home to the alleged "Vampire of Venice."

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

One of the most poignant ruins of the Chernobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

Bits and pieces from the ill-fated Donner Party's winter cabins.

This grand mansion has starred in everything from Bones to Buffy.

A ghost town at the airport is now a refuge for blue butterflies.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

A world-class observatory in the California desert.

The largest permanent Monopoly board makes one of the longest games even bigger.

This impressive tunnel was dug entirely by hand over the course of 36 years.

This glamorous old building is said to have inspired the Tower of Terror.

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

A hidden subterranean installation offers a view of the sky.

This massive redwood tree has a hole in the base big enough to drive through.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

Ingenious bakery opens up the first Cupcake ATM at their flagship location in Beverly Hills.

One of the most unusual geological features, recognizable from a dozen hit movies.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

The abandoned personal amusement park of the King of Pop.