The palace of the King of Kings, burned by Alexander the Great.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

A sophisticated astronomical tower built by one of the greatest Persian scholars of the Islamic Golden Age.

When the rain falls, this drain system turns into a musical instrument.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A collection of abandoned typographic signs from Berlin and beyond.

This small Slovenian town has become a magnet for microbreweries.

This controversial, abstract sculpture is meant to represent an Aztec warrior.

The first modern cemetery of Lyon is complete with more than 200 chapels and monuments.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

An unusual "skull with ears" sits in the crypt of this small church tucked away at the end of a narrow alley.

This botanical garden boasts sculptures, industrial ruins, and an endorsement from the Dalai Lama.

This 7,000-year-old megalithic wonder covered by a Franco-era reservoir emerges in times of drought.

Step into Monet's world at this fine-dining restaurant in the middle of a New Jersey sculpture park.

High in the mountains of Kochi Prefecture, a magnificent library designed by a world-famous architect.

A monument to the migrants who cross the dangerous waters between North Africa and a tiny Italian island.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

A lake in the middle of the tundra of Quebec is said to be the purest freshwater lake on Earth.

The large fjord lake is thought to be the home of "Ogopogo," a giant sea serpent.

A monument to the 17,000 Chinese who worked and died to build Canada's Pacific Railway.

A neutrino detector built into the largest man-made underground cavity in the world.

Every fall this lake mysteriously drains, like a bathtub with the plug pulled out.

This natural wonder is disappearing at an alarming rate.