The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

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

Fittingly, America's museum of architecture is itself a magnificently designed old building.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

These unusual rooms on wheels are holdovers from the 1960s.

Home to items never before seen by the public.

The rogue roots are gradually consuming some of the historic marble grave markers.

The oldest continuously operating fish market in the United States.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

The romance of early commercial flight still fills this Art Deco destination.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

The narrowest house in America is seven feet of pure spite.