The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This isolated island is often capped by its own fluffy cloud.

Spend the night in this formerly abandoned traditional Scottish village.

This disused Cold War bunker has been restored to all of its early 60s glory.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

A riverside park built around the ruins of a massive dam that collapsed in 1909.

The highest tides in the world come in and out here twice a day, allowing you to essentially walk along the ocean floor.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

This historic little railroad runs through some of the most beautiful scenery in Germany.

Eritrea's futuristic gas station is a nod to Italy's fascist history.

A comprehensive collection of bonsai set in a beautiful campus.

The first recognized Neanderthal remains were found in this now-lost cave in 1856.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

A swath of France so devastated by war it is still forbidden to go there.

A retro walk through the history of the tube.

An isolated, rusty phone booth commemorates Iceland's first international telegraph cable.

The largest of only eight working transporter bridges left in the world.

Stone slabs along the coast warn of Japan's tsunami-ravaged past, often marking the highest point of a wave's reach.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

The steepest classic funicular in the world glides along a dizzying incline.

New Zealand's west coast is one of the best places in the world to view these large seabirds.

A tiny museum in Esperance, Australia, displays a bunch of space debris from NASA’s Skylab.