The best-preserved ancient theater in the world.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

Macabre astrological automaton clock dating to the late 1400s.

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

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

A tunnel with windows, so you don't miss out on the impressive views.

World's second largest particle accelerator, where nature reveals its secrets.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

"X" marks the spot of an echo chamber in the middle of a plaza.

Local myth claims this is a Sears catalogue home with its windows installed upside-down.

An early-19th-century hotel with a past that is steeped in the Civil War.

The humble beginnings of one of America’s greatest songsmiths.

The "last unrestored grand mansion of Savannah" is now a cramped, mouldering maze of antiques.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

A fake medieval village in the middle of Turin.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.