An extraordinary "City of Caves" carved from solid stone.

Sacred Indian temple that’s all monkey business.

The remains of what was, not so long ago, the world's largest city.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

A German apartment building hosting as many trees as human occupants.

A fascinating insight into daily life in the Eastern Bloc.

The stoutest tree in the world.

This beautifully deceptive waterfall is something far different from what it appears to be.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

Mexico's astounding mummy museum with "the world's smallest mummy."

Extraordinary sculpture garden created by an eccentric English poet.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A Russian museum dedicated to the household staple, the samovar.

300-year-old villagers houses and traditional churches preserve a nearly lost piece of Russian history.

Gargantuan home of Russian science.

An ever-growing literary collection housed in the apartment where the Russian author penned his final novel.

A 360 degree battlefield experience.

Replica of mosque destroyed by Russia in the 16th century.

Former headquarters of the KGB.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.