This Irish museum in a historic 19th century market pays tribute to the glory of butter.

A small obelisk commemorates the launch site of the world's first liquid-fueled rocket.

These barriers stand as stark reminders of Northern Ireland's troubled past.

This museum is dedicated to the most famous Irish writers in history.

Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

The house where the writer spent his formative years.

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

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

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

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

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A painfully obvious spy house sits right across the street from the Russian Embassy.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The site of the climactic scene from the classic horror film is now a historic landmark.

The United States Capitol's former columns still stand.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

A picture-perfect town, perfect for blowing up.

Large tower used for simulating radiation of Hiroshima bomb and the tallest object ever relocated.

The site of an underground detonation of a megaton nuclear bomb in the middle of the Mojave Desert.