Colorful and chaotic stacked hotel in North Holland.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

Residing along a busy thoroughfare, this sculpture urges passersby to consider the future.

The final resting place for a wealthy Roman family, this tomb might be the best preserved of its kind outside Italy.

How did a lighthouse wind up in the middle of this landlocked German city?

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

This magnificent brick dome was made with an unusual design method.

Giant topiary dog once played a role in a terrorist bomb plot.

An out-of-place grove of sequoias thrives in northern Spain.

A medieval village holds a very modern hotel.

Abandoned 18th century weapons factory in the Aezkoa Valley.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

To the famous surrealist artist, liberty required two torches held high.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.