The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

This Roman relic was discovered in Scotland by a mudlarking ferryman.

Protecting the dead from opportunistic body snatchers.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

The final resting place of soldiers' loyal canine companions.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

Look closely and you’ll notice that the color changes a third of the way up the tower.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

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

A much-maligned monument to teetotalism.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

The beautiful non-repeating pattern honors the Oxford professor who discovered it.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

The final resting place of England's most notorious bandit.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.