Switzerland's oldest public observatory is an important part of the Zurich cityscape.

Use a key to unlock this medieval sewer tunnel.

Constructed along the shores of Lake Zurich, this pavilion is a walk-through work of art.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

The attic of a four-century-old canal house hides a clandestine church.

Centuries of warfare, tragedy, executions, and poetry come together in this 13th-century fortress.

Life-sized bronze statues of fictional puppet characters.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A monumental golden thumb rises as an iconic homage to Nouveau Réalisme, bold in scale and unapologetic in spirit.

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

A futuristic rocket marks the spot where three borders meet.

This 42-foot tribute to the workforce still reminds us to pause and recharge.

This ferry carries passengers across the Rhine propelled by no engine or paddles but by the river's current.

An interactive exhibition space dedicated to the kinetic sculptures of Swiss artist Jean Tinguely.

This artistic fountain display pays homage to this area's theatrical history.

A dazzling display of lights and crystals.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

This whimsical fountain pays tribute to Toronto's four-legged friends.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.