One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A subterranean house of worship carved right out of the bedrock.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Site of the 1889 murder-suicide of crown prince Rudolf and his lover Mary Vetsera.

Buried in the Laos jungle is a sanctuary for bears that would have otherwise been milked to death by poachers.

This hilltop warren of monastic dwellings is the result of centuries worth of Mongol attacks.

This high-design church is made up of two dizzying spirals meant to evoke the weaving together of marriage.

Britain's answer to the NSA is based out of this deliciously-named circular headquarters.

The world's oldest rose is so tough it survived being bombed in World War II.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

World's largest crossword puzzle spans the side of a towerblock, its clues scattered throughout the city.

A fortress built to pacify local uprising that had a stint as a Nazi concentration camp before becoming a five-star hotel.