An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Fine dining in the bizarre world of Lewis Carroll.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

A giant Troll lurks under one of Seattle's oldest bridges.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

A hand-built folk art installation covered with messages of God's love.

America's most famous piece of self-built architecture.

An Australian lake whose pink hue defies scientific explanation.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Notorious artist squat renovated into legal studios.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

A 16th-century horror show built in a lovely Italian garden.

Hot springs monkey spa in the middle of Hell's Valley.

The legendary building that needed ghostly approval before being built.

An eerie, derelict amusement park in Berlin.

The fairy tale castle of the "fairy-tale king."

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An emerald-green grotto just a short trip from Austin.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.