This stone tower was built to protect Crete from incoming pirates.

A fascinating insight into daily life in the Eastern Bloc.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The grounds and buildings of an old wood pulp mill have been transformed into an innovative art park and museum.

This floating sculpture of ice is a poignant reminder of nature's power.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

Black cat statues guard this temple-like Egyptian revival factory.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Eighty million natural history specimens call this gargantuan museum home.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A stunning architectural yet functional feat, towering over Oslo.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This is the oldest Roman-made bridge in the city still existing in its original state.

These small, triangular, colorful houses are a staple of Madeira Island.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

The curios of pharmacist and collector Henry Wellcome.

One part local history, 99 parts gruesome haunted house.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

The design of this beautifully crafted building was inspired by Norwegian glaciers.

World's strongest whirlpool.