Three hundred years of preserved Spanish colonial history in San Antonio.

A former electrical substation is now home to an eccentric junk art masterpiece.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

Free public park and gardens filled with peacocks and peahens.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.

Sofia's legislative center is continuously reinventing itself.

"Holy Wisdom" overlooks the city that became its namesake.

A striking symbol of the Bulgarian capital.

This historic black and white monastery is one of Bulgaria's architectural jewels.

During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.

The school tested mustard gas for the U.S. Army during World War I.

An overlooked memorial honoring the local Washington residents who died in World War I.

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.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

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

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

The most accurate timepiece in the world.