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

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.

Natural time capsule containing an alien ecosystem.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Roman ruins top white travertine terraces formed by ancient hot springs.

The world's largest military aircraft cemetery.

Despite its name, this route in southern Utah offers a heavenly day trip.

A gargantuan crystal kingdom.

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.