The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A corkscrew-shaped barn in Ireland.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

An ancient neolithic tomb that only sees the sun twice a year.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Site of the 1889 murder-suicide of crown prince Rudolf and his lover Mary Vetsera.

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

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Artfully arranged bones of 5,800 Austrians.

Hear, smell, see, taste, and touch history at this immersive Civil War hospital.

The taxidermy remains of the most popular pony in children's literature.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

A "hospital" where people went to be quarantined, die, and be buried in the yard.

A quintet of history museums make this Virginia graveyard as much a resting place for funereal history as it is for people.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

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

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

An alternate history park where the Union Army loses the war... to dinosaurs.