Places kunk Wants to Go

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

The walls of the iconic dome are hollow and have a secret stairway.

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

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

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Cryptic messages embedded in the New York City sidewalk.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

360° views of the city plus five floors of optical illusions and hands-on science.

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

A church that bred legends, and served as an inspiration for the Da Vinci Code.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

Glasgow’s piece of the patron saint of love.

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

Some of the saint's blood and bones are said to reside in Dublin.

The oldest licensed distillery in Ireland.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

This collection of bronze hands comes from astronauts, presidents, baseball greats, and more.