Famously misunderstood wonder of the ancient world

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

Come for the flowers, stay for the bats!

This demon atop the Notre-Dame de Paris looks utterly bored.

The celebrated eyesore created by starry-eyed sweethearts.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Indents in the pavement are all that remain from a grisly death machine in Paris.

The "dragon babies" of southeastern Europe.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A miniature train-ride through Slovenia's largest cave system.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Feed it cash, get your very own gold bar.

The world’s largest LED display, built over an F1 race circuit.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

Bridge that died in war and was resurected.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

A majestic hotel for dreamers rises from the center of a fairytale wood.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.