An ancient Egyptian temple in the middle of Madrid, Spain.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Balconies that have a most unusual accent.

A French library that makes sure its love of books is writ large... giant in fact.

This simple home was the beginning of a long journey for the iconic Western film star.

A hollow cement depiction of time's inexorable effect on the human body.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

First planned industrial community in the United States.

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

This former insane asylum now holds a pathological anatomy museum.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

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

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

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

A Hungarian pharmacy museum with a box full of mummy powder.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

Once the home of a hermetic monk, this cave now houses a small church.

The world's longest known cave system.

Hot Doug's "Hot Dog" Stand.

An antiquated German apothecary on Chicago's North Side.

Pizza with a side of fine art.

Wisconsin's most celebrated export gets the royal treatment on I-94.