Countless grotesque faces stare out from this eerie Prague art wall.

A historic Civil War estate-turned-museum looks back on the Confederate States of America.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

A preserved stretch of ancient fossilized trees with an impressive gem collection to boot.

A decaying building marks the site associated with Emmett Till's brutal 1955 murder, which helped sparking the civil rights movement.

This two-room shotgun shack in Tupelo is the birthplace of a King.

This university research project is the U.S. government's weed dealer.

In the mid-20th century, a tamale-slinging juke joint attracted a diverse clientele in the Mississippi Delta.

A 200-year-old bar is all that remains of one Mississippi River town's rough-and-tumble past.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.

A Muppet museum in small-town Mississippi honors the roots of Jim Henson's most beloved creation.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

The tomb of history's greatest potato promoter is surrounded by tubers.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

Tourists often confuse this beautifully ornate former cigarette factory for a mosque.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The world-record holder for the longest bridge stretching continuously over water.

Chelsea's soldiers were given strict orders when crossing this historic bridge.