Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

A misunderstanding gave this 18th-century racehorse a most amusing name.

The longest living non-clonal organisms on Earth.

An ancient stone fortress considered by many to be the eighth wonder of the world.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

After surviving decades of medical testing and civil wars, these chimpanzees were abandoned on their own islands.

This ancient sword lay in a waterlogged tomb for 2,500 years, but managed to remain relatively untarnished and impressively sharp.

Enormous sandstone towers loom within a Czech forest.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

Flames have been burning within this mountain for more than 2,500 years.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

World's largest cave was only discovered in 1991, and now offers tours to the public.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

A Frankenstein blend of science and art allows one tree to produce 40 different types of stone fruit.

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.