Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

An oasis of shade and color amidst the bustle of the old city.

A 16th-century Andalusian palace.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

The world's largest wooden structure.

Founded as a refugee camp, now a popular tourist spot.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The other side is actually green.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A statue honors the children who fought Nazis in Poland.

Hundreds of notes give thanks to the patron saint of lost causes.

These traffic lights celebrate the 100 year anniversary of the women's suffrage movement in Lithuania.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

This micro-nation may be some sort of prank, but its constitution sure seems official.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.