A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

This frozen-in-time summer home outside Moscow provides a look at Russian life in the 1950s.

A Tucson museum and performance space full of found-object movable sculptures.

Beautiful antiques and obscure engineering artifacts trace the evolution of phones from rare luxuries to ubiquitous.

A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

A mysterious ancient network of thousands of perfectly straight lines stretching across miles of Bolivian desert.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

The first rural cemetery west of the Mississippi is home to the elaborate tombs of St. Louis' local beer barons.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

This banal Parisian entranceway is not what it seems.

Where school buses go to die and be reborn as whimsical works of art.

Inside a humble hangar is some of the best roller derby the world has to offer.

A French artist's vague warning hangs over Belleville.

Ireland's only German military cemetery holds the remains of a spy who was moved there under the cover of darkness.

The medieval network of canals hidden underneath the city is opened to explorers each year.

Perhaps the most scandalous statue of America's first president.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Nuclear waste experts study this prehistoric crater lake to envision landscapes one million years in the future.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.