Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

Vast stretch of tide-pools with a unique Moroccan charm.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

Lucerne's central prison was converted into a tourist hotel with a bare minimum of changes.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

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

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

The interior of this church has been turned into a memorial to locals who died in Croatia's Homeland War.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This military tunnel dates back to World War II and provides visitors with a little wartime adrenaline.

Go inside to really appreciate this 500-year-old technological masterpiece.

A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

In the shadow of a former battleground, the resting place for nearly 2,000 soldiers who died in World War I.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

Shoes and revealing shirts are not allowed inside this giant Vietnamese Christ.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

One of the oldest temples in Ho Chi Minh City, dedicated to a deified Chinese military leader.

Nearly three tons of weapons from the Vietnam War still remain in this small, hidden museum.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.