This four-story steel sphere in Maryland was used to test biological weapons.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

The smallest covered bridge in Maryland.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

A Civil War Museum with some notable medical antiques.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

One of the only memorials dedicated to journalists who died in combat.

Built by the patriotic residents of Boonsboro in a single day.

Bizarre Cavern.

Once damaged by Hurricane Agnes, this bridge is now on the National Register of Historic Places.

Next door to Tokyo DisneySea is a giant sculpture created by Taro Okamoto symbolizing the dynamism of life.

This ambiguous pig shrine is actually a monument to a beloved queen.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

Buddhist university that allows English-language speakers the opportunity to study with monks in Thailand.

Bangkok's men with dangerous jobs come here in search of protective talismans.

This fountain pays homage to Qatar's history of pearling, the primary industry before oil.

This seemingly random 30-foot statue of an oryx in Qatar's capital was a mascot for the 2006 Asian Games.

The facade of this bank has changed little over the centuries, including its unique welcome sign.

Europe's official "zero-level," the equator of elevation.

The spectacular history of spectacles on display.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

This basement museum explores the art and artistry of fascism.

A floating cat sanctuary on an Amsterdam canal.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.