A massive sustainable farm designed by the mastermind behind Central Park.

The home of half the world's population of critically endangered mountain gorillas.

One man's extraordinary topiary garden in a small South Carolina town.

These strikingly barren, rolling red hills were caused by bad farming practices.

These hellish-looking cliffs in the Canadian Arctic have been burning for centuries.

In Northeastern Iceland lies something of an oxymoron: a steaming desert.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

A moving memorial to the fallen and missing from WWI trenches.

The bombed out remains of the old church were kept intact next to the new one, as a reminder of the futility of war.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

A Roman spa buried deep beneath the City of London.

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

This surreal-looking tree pruned more than 1,000 years ago is still producing olives for oil.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

A patchwork of ruins from various civilizations in one of the world's oldest continually inhabited cities.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

The ruins of a medieval monastery built on a perilous slope.