Absolutely no saxophones in the library.

These markers are used to determine the ground stability of the Strip.

A flight of this "ghost staircase" has 40 steps on the way up, but only 39 steps on the way down.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

A triumphal steel arch on the side of a German mountain.

Dine amidst exotic plants at this former royal greenhouse.

Light still pours into the ruins of this ancient Islamic observatory.

An architectural marvel that dates back to the zenith of Indian architecture.

A secluded, little-known temple hidden amid the dense jungle.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

The original resting place of Queen Cleopatra and Mark Antony's only daughter.

Five candy-colored villages on the Italian Riviera.

Monasteries on rock pillars, once accessible only by frayed ropes.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Started as a kitchen garden, now the second largest botanical garden in the world.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

An exquisite tunnel of cascading flowers.

Rippling sand dunes frozen in the Arizona rock.