This roadside shrine to an unofficial saint has welcomed the wishes and prayers of local believers for generations.

Maybe the only restaurant in the world where your seat will be signed by a Nobel laureate.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

This centuries-old mine remained hidden beneath a hotel bar until 2013.

This subterranean passage reveals the city's mining history as well as its legendary terrors.

A cozy bookstore is tucked within an old gold mine shaft beneath the cafe and ice cream shop.

This mysterious artificial cave has long puzzled New Englanders.

This is the house that spite built.

Anyone can control this glittery light installation with just a phone call.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

This lesser known Hearst estate is a fairytale village built from the stolen bones of historic European buildings.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

The long, arduous journey of the stones of the Abbey of New Clairvaux.

Home of what was the largest hydraulic mine in the world, producing gold and the first diamonds in the U.S.

A working miniature city designed to teach kids about safety and presumably city planning.

On the summer solstice each year, shadows align with a 14,000 square foot painting to reveal a secret message.

The largest drain hole in the world.

One of the largest Buddhist communities in the West sits on the site of an old hospital.

A veteran Disney animator turned his gift for storytelling to a museum devoted to his love of a California city.

This historic California cemetery holds the bodies of veterans of both the Civil War and the Donner Party.

California's own majestic geyser is powered by a subterranean volcano.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

The haunting ruins of Jack London's dream house.

The final resting place of a woman who never gave up on love.