Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

The final resting place of the great navigator, or maybe his brother.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

This historic boathouse was constructed using salvaged lumber from burned barns.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

The tunnel under the Capitol Building where Congress takes out its trash.

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.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

A line of blue paint marks the route of the inaugural parade.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A portal into the bricked up canal that runs through the heart of Washington D.C.

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

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

The world's oldest soul food restaurant is also one of its best.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.