This memorial museum chronicles the apocalyptic destruction of the First World War.

A moving memorial to the fallen and missing from WWI trenches.

A rare example of World War I trenches from the British front.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

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

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

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

A high-octane shrine to the greatest Texans who ever lived.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Former self-sufficient mental institution now a planned community.

Strange physical sensations and optical contradictions keep visitors coming back for more.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

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

Once the tallest building in Detroit, this Gothic church houses some of the oldest stained-glass windows in the country.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

Detroit’s downtown castle is one of the oldest structures in the city.

38-story baroque tower reflecting Detroit's rise, fall, and possible rise again.

The world’s largest Masonic temple was saved by the White Stripes.

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

One man's attempt to create an artistic wonder on a run-down block in Detroit.

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

This sprawling bookstore spans four floors and has more than a million books in stock.

A statue honoring 44 continuous years of greeting passing ships.

This kitschy tavern is also home to rare early editions of "Treasure Island."