The former global standard for the exact mass of one kilogram sits under lock and key outside Paris.

The oldest operating steam locomotive in Canada runs along this heritage railway.

A sprawling museum located on the former site of the Orphan Girl Mine.

The oldest continuously-operating Chinese restaurant in the United States has been in business since 1911.

For just a few hours each morning, this market serves specialties from the city's shrinking Chinese-Indian community.

A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

This old-fashioned carhop restaurant gave the world the waffle cone.

A cement mixer-turned-kaleidoscope in downtown Norfolk offers different views of the city.

For roadside fast food, pull over at the giant orange.

The dramatic upward-curving roof is one of the most iconic examples of Googie architecture that still stands today.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

Drive past the giant fruit sculptures and up to the window for a menu of fruity treats.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This lonely gas station has stood at this location since 1917.

A skeletal collection of former nautical mainstays.

This decommissioned DC-3 now forever points into the oncoming wind.

A famed drink seasoned with an amputated toe, now on its tenth digit.

A lasting testament to the Klondike Gold Rush.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.