This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

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

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

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

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

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

The "lovely red Vega" of the legendary record-settling pilot.

A celebrity from the late Cretaceous period.

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

Visit this playground of waterfalls, caves and sinkholes.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

Romania's triumphal arch looks out over Bucharest.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

Something's watching you.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

A mysterious shape catches the eye in this 16th-century painting.