A simple plaque remembers an act of WWI terrorism that obliterated an island and forever scarred the Statue of Liberty.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

A quiet memorial to those who died saving others in the heart of the City of London.

The anatomical-pathological collection of a man who changed surgery.

Dictionary Johnson’s favorite feline.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Home to items never before seen by the public.

A misnamed well, with a deep dark past.

These Nubian pyramids are strange and unique, even by pyramid standards.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The royal seat of Henri Christophe, a formerly enslaved man who became Haiti's only king.

Thousands of Haitians travel to the waterfalls to ask the Virgin Mary of Mount Carmel and her voodoo counterpart Erzulie for healing in a yearly pilgrimage.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

Mineral springs believed to hold therapeutic properties draw in visitors from all over.

Underwater roads undetectable from the surface used for escape routes from foreign invaders.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The largest underground church in Europe.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

America's post-nuclear-attack chambers of Congress.

A gateway to a mysterious network of underground tunnels.