A gift from Emperor Franz Joseph I to his wife.

A museum capturing one of the world's most famous classical composer's battle with hearing loss.

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

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

A magnificent collection of imperial armor and weaponry.

This museum is dedicated to the little known ancient Roman history of Vienna.

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

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

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

The topiary maze at the Habsburg hunting lodge.

Giant granite rocks standing end-to-end like a train of circus elephants.

Hundreds of graffiti artists have decorated this flood-wall on the west bank of the Mississippi River.

Cannon designed to fire an atomic warhead.

This downtown Dallas art installation is always on the lookout.

A symbol of Texas pride.

Belly up to the bar in Cowtown, don't forget to buy some boots.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The Grand Canyon of Texas.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

Curious cave that stays a cool 56 degrees all year long.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Less a museum than a bizarre fantasy world created by artists and engineers.

The eccentric and colorful pavilions of Tower Grove park are a beloved and overlooked symbol.