Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

The oldest housing complex in Riga is a mini timeline of architectural trends.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

This "floating railway" is one of the world's oldest monorail systems.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

This abandoned Greek island was the last active leper colony in Europe.

Elvis's own personal tropical hideaway.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

There must be a pun in this haystack somewhere...

Walk into the 19th century without leaving Brooklyn.

A popular European tradition makes its way to the states on one of America's most famous bridges.

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

These mansions date back to Chicago's days as a brewer's paradise.

A display of magnificent stained glass windows is the first exhibit of its kind.

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

After the parade, students throw their beads on the tree hoping for good luck on exams.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

The final resting place of New Orleans' most famous voodoo priestess.