This modest marker near Notre Dame identifies the very center of Paris.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Famously misunderstood wonder of the ancient world

The largest stone circle in the world has ended up bringing up more questions than it has answered.

The plaques around this 19th-century structure recall some rather strange tales.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

This hidden sculpture garden full of Wild West art is one of San Antonio's best-kept secrets.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

A health museum containing a 27’’½-foot intestine.

A little bit Wonkatania, a little bit pink elephant.

This small park features a monumental fountain wall, providing a great photo opportunity in the middle of Houston.

According to the legend, this structure was built in a single night with the help of the devil.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

These temples are among the oldest free-standing stone buildings in the world.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This stone tower was built to protect Crete from incoming pirates.

A charming beach town in Turkey captures all the colors of the rainbow.

Plaques on its facade commemorate the Tiber's most destructive deluges.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

A massive marble foot is tucked away in a small alley near the Pantheon.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.