The world's oldest continuously operating airport was founded by the Wright Brothers.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

The whole world in one water tank.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

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

An astounding collection of medical specimens, including bits of President Lincoln.

An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

A museum dedicated exclusively to aircraft used in the military.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

An original apothecary from 1792.

An early 20th-century bullring converted into a modern shopping center.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Mountain where Jesus was first tempted by the Devil.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.