The vast, legendary catacombs hold secrets much stranger than stacked bones.

This historic graveyard was partially paved over to create a streetcar line.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

The last of Amsterdam's original sea level markers remaining in place.

These ornate arches show how the course of the River Thames has changed.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Legendary site where an evil bishop was devoured by rodents.

This marvelous array is one of the largest collections of mechanical instruments in Europe.

This enormous World War II relic is one of the largest wooden structures in the world.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

Back in the day everyone who was anyone played this historic western theater.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

An inconspicuous suburban street corner is the site of San Diego's worst air disaster.

The lecture hall where Alexander Graham Bell first demonstrated the long-distance phone call.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

A museum dedicated to restoring vintage aircraft, located at a working airport.

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

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.