This 11th-century Cistercian abbey was once seized by Henry VIII.

A vintage fire engine is hidden inside this World War I-era water tower.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

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

At 22 feet tall, these Bronze Age monoliths are some of the tallest standing stones in the United Kingdom.

This mushroom-shaped rock has frustrated and fascinated locals for centuries.

This dazzling wooden church was constructed as part of an elaborate peace project after the Thirty Years' War.

One of the only spherical 19th century gas containers left today.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

One of the largest amphitheaters in Europe is a former Nazi German gathering place that still stands today.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

World's tallest cigar-shaped radio tower.

A memorial museum to the political prisoners who were held at Sighet Prison, once one of the most feared places in Romania.

A collection of items from a way of life that no longer exists.

Something's watching you.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

Climb inside an iron crystal magnified 165 billion times its normal size.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This hidden museum examines the complex history of the country's law enforcement.

The statue honors a beloved bird that once roamed St. George's Market.

The last Victorian market in Belfast.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

It was once nicknamed "the most bombed hotel in Europe."

Originally commissioned as a sculpture to reflect the history of Belfast's red-light district, the final sculpture has been banned from Belfast public land.