An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

Giant topiary dog once played a role in a terrorist bomb plot.

God's Saharan sandbox of wrath.

Vast stretch of tide-pools with a unique Moroccan charm.

Traditional 11th-century outdoor tannery.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

The other side is actually green.

Founded as a refugee camp, now a popular tourist spot.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

The colonial city's social history is reflected in its fanciful door knockers.

An ancient octagonal weather station named for the eight Greek gods of wind.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

An enormous, inside-out glass globe built in 1935.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."