A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

Designed as a reminder of one of the darkest moments in Austrian history.

An ornate private entrance to the Vienna subway built specifically for the emperor.

The topiary maze at the Habsburg hunting lodge.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Visiting this café is like visiting the Austrian grandma you wish you had.

Museum devoted to the artificial language of Esperanto.

Handsomely crafted representations of our round planet.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Baroque celebration of the end of the Great Plague of Vienna.

Legends surround an ancient tree trunk riddled with nails for good luck.

The solemn exterior conceals an opulent interior of this 17th century church.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

This fascinating museum in an old water tower holds the world's largest collection of Vodou artifacts from western and central Africa.

The curious underground history of keeping Paris clean.

This bridge was constructed from the rubble of the infamous Bastille.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The celebrated eyesore created by starry-eyed sweethearts.

A museum of carnival attractions where you are invited to ride the rides.

Ordinary art transforms to extraordinary thanks to locals' quirky sense of humor.

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

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.