The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

This remote fort on the Yukon River is a vestige of the wild Alaska gold rush.

In the early 1900s, hundreds of Black Americans found opportunity in this now-abandoned rural community.

The world-record holder for the longest bridge stretching continuously over water.

This conservation area filled with colorful birds is the last community forest within the city of Kathmandu.

This small shrine dedicated to a fish is believed to hold the secrets to this historic market's founding.

This elegant neoclassical garden is a peaceful oasis in the middle of the Nepalese capital.

Former host to the World Elephant Polo Championships.

Adjacent to Narayanhiti Palace, this park commemorates those who fought in Nepal's civil war.

Ancient serpentine sacrifice holder that has stood the test of time.

A tiny park in the middle of some big power politics.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

These quintessentially English stepping stones were built for Victorian tourists.

The longest manmade tunnel in Queensland is now a beautiful trail, home to a special colony of bent-wing bats.

This trail follows unique stone railroad tracks and a historic waterway to the south coast of Devon.

A winding medieval path was used by mourners to carry their dead to the nearest church.

This extravagant villa built by a Burmese merchant is part pagoda and part European mansion.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

This 19th-century pub features stained-glass windows celebrating Victorian-era "champions."

The roof of one of the world’s largest spice markets provides a grand view over the neighborhood's glorious bustle.

These experimental weapons brought World War II to Nebraska as well as 26 other U.S. states.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

A pair of stones embedded in an Edinburgh street memorialize one of the city's last public hangings.