This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A striking symbol of the Bulgarian capital.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

The longest enclosed pedestrian bridge in the world spans 14 lanes of traffic and six rail tracks, all while lighting up the night sky.

One of the largest underground systems runs under Canada's largest urban center.

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

The giant birds honor two native North American species.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

This sculpture was made in 1973 for the city's 300th-anniversary celebrations and was largely considered an eyesore at the time.

This giant Canadian coin is a monument to the artist who created its iconic emblem.

The remains of a once-famous hotel that also acted as an artist colony.

This seemingly cursed monument is dedicated to one of Canada's great war heroes.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

This urban oasis is a marvelous meld of music and landscape architecture.

This Hindu temple is an architectural marvel designed and built according to ancient Indian principles.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

These strikingly barren, rolling red hills were caused by bad farming practices.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

An abandoned relic of the city's failed experiment with below ground transit.

The trials and tribulations of marking Poe's grave.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

A second generation sun-powered marvel lights up the night.