The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

At 207 feet, one of the world's longest continuous escalators.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

A hugely vast Irish landscape of barren rock that stretches for miles.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The ancient tomb acts as a calendar that keeps perfect time.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

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

This memorial complex contains several mass graves for victims of the Siege of Leningrad.

Perhaps the tiniest sculpture in Saint Petersburg is a little bronze finch inspired by a song.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

The past, present, and future of Russia's signature alcohol is remembered in the world's only museum dedicated to the starchy spirit.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.