Some of the specimens on display at the Leiden University Medical Center have been helping educate physicians since the 17th century.

The world’s first interactive human body museum also serves as a chair for a giant orange man.

In the Netherlands, one of the world's largest private car collections can be found.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

The largest 19th century panorama in the world still in-situ.

Lumps of significant stone from around the world surround a flaming monument for peace.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

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

This fortress-like monastery is covered with intricate frescoes.

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

A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.

One of the largest busts in the world celebrates the German city's erstwhile namesake.

The largest manmade caves in Europe now function as a motorbike club's headquarters.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

This striking fort on the Maginot Line looks just as it did after being destroyed in the Fall of France.

The place where World War I began.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

Giant origami crease patterns engraved in Santa Monica intersections may even be visible from space.