The world's oldest railway bridge in continuous use.

Constructed on the ruins of a convent, this tower saved countless lives.

A breathtaking 19th-century trail overlooks Lake Tahoe.

Propped high atop the peak of Mount Gamsutlmeer, this abandoned village is one of the oldest settlements in the region.

The frozen treats at this Cape Town parlor are inspired by Africa's food cultures.

Perhaps the most spectacular grotto along the Algarve coastline.

One of the world's tallest flagpoles.

Many generations of travelers have passed through the steep, smooth walls of this canyon.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

The highest cold-water geyser in the world.

The first passenger cable car in the world.

Art Deco stylings conceal the true nature of this bridge.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

Believed to be the country's tallest waterfall, the Njupeskär is actually much smaller.

Large World War II gun emplacements and tunnel systems remain hidden near a remote end of Waiheke Island.

This apartment is a true time capsule of local life in Bulgaria during the Soviet regime.

Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

An architectural gem nestled into a promontory overlooking a prehistoric landscape.

One of the most popular attractions in the small resort town of Kabardinka.

Nearly three tons of weapons from the Vietnam War still remain in this small, hidden museum.

This park in Nagarkot boasts one of the best views in all of Nepal.

Inside this old train depot resides a multi-line model train covering western North Carolina.

Eat your Big Mac in a DC-3.

An abandoned mansion is now a haven for urban explorers.