In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An exotic wildlife habitat right off The Strip.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Just a man taking his prehistoric pet for a stroll.

This sprawling collection hides many charms.

Soaring over the Niagara Whirlpool since 1916.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

100 year tradition of fist fights, marked by marble footsteps.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

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

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

The glowing blue Nymphaeum of Emperor Tiberius.

The granite head appears to be deep in thought and half buried in the ground.

This natural wonder is disappearing at an alarming rate.

The collection of signage remembers the midcentury pushback against the new neon light.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Fortified medieval tower house with lovely roof garden.

A Nesting Doll of Churches.