Designed to serve primarily the Maharaja, this is an interesting variation on the traditional stepped well.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

Experience what life was like in Ireland during the Viking and medieval ages.

The first of Lancaster's "rural cemeteries."

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

A field of nothing but boulders which resembles a giant's gravel driveway.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

This 16th-century Moroccan fortress-turned-armory museum offers prime views of the historic quarter in Fes.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

This garden houses the remains of the ancient Greek port of Marseille.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

A long-buried ancient ruin unearthed right in the middle of the city.

The final resting place of the world's first nuclear reactor.

A fascinating assortment of cave dwellings, medieval ruins, and sarcophagi are being devoured by the forest.

One of the highest Roman forts in Britain is set amid dramatic scenery on a notoriously difficult road.

These tiny statues form a terracotta army from China's Han dynasty.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.