An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

A king's bloodstained shirt is among the gruesome collection of artifacts displayed below Stockholm's Royal Palace.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

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

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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Washington's iconic carousel has a nice piece of Civil Rights history.

This grand gothic brewery has been pumping out suds for over a hundred years.

Go take a picture with the inventor of the daguerreotype photographic process.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

A nostalgic bibliographic gem.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

Coins and medals straight from the mint await visitors to this shop in the nation's capital.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Home to a vast and influential collection of Shakespeareana.