66,000 pieces of art, donated by one of the world's richest men.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A massive underwater sinkhole made famous by Jacques Cousteau.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

Go inside to really appreciate this 500-year-old technological masterpiece.

This one-time health resort was used by aristocrats around the world.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A historical convent known for taking in bad luck babies left on its doorstep is now an upscale shopping center.

Singapore's landscaping project is home to 18 incredible Supertrees.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.