Island where motor vehicles are banned -- home to the only carless highway in the United States.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

This historic rec center in the heart of Israel is a bastion of peace and togetherness.

Real bones which are said to have belonged to a Polish dragon.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

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

An unusual round church in London with a Templar past.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

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

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The final resting place for the remains of 143 Habsburg royalty.

Budapest's Communist-era statues, banished to the suburbs.

Museum dedicated to the terror regimes of Hungary.