Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Hear the quietest sound from across the dome.

The site of Paul Revere's historic two lantern warning.

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

Yo, Adrian!

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Home to items never before seen by the public.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The celebrated eyesore created by starry-eyed sweethearts.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Northern Ireland's Brobdingnagian stepping stones.

A beautiful geyser under environmental threat.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

Macabre astrological automaton clock dating to the late 1400s.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Famously misunderstood wonder of the ancient world

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

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

Elevated freight railway turned wildly successful urban park.

This demon atop the Notre-Dame de Paris looks utterly bored.