Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

A marvel of Byzantine engineering under the streets of Istanbul.

A vast floating ceiling ripples above the terminal like the waves of the Red Sea meeting the surrounding desert.

There are ongoing efforts to preserve this village, the best known work of Egyptian architect Hasan Fathy.

The remains of an ancient settlement in one of the oldest archeological sites in South America.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This lake with an inactive volcano underneath is often said to be bottomless.

A violent name for a violent volcano.

A relic of roadside lore and perhaps the first of its kind in North America.

A fitting attraction for the corn capital of the world.

The 10th-tallest pyramid in the world, this former sports arena is now home to a massive Bass Pro Shops store.

Elvis's own personal tropical hideaway.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

A museum and shop on Bourbon Street located in the French Quarter.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

The world-record holder for the longest bridge stretching continuously over water.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Rummage through this sunken ship, but leave your scuba gear at home.