This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

One of the few surviving street funiculars in the world.

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

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

These unusual rooms on wheels are holdovers from the 1960s.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

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

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Dramatic river bend surrounds a natural red-rocked pedestal.

A six-ton wedding present for the King of the Scots.

The most loyal of little dogs, or a Victorian era publicity stunt?

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

Northern Ireland's Brobdingnagian stepping stones.

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

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

Before Nixon, "watergate" meant canals.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.