It takes a nine-mile hike to reach these hot springs, but weary hikers are rewarded with stunning views and a warm soak.

A cable-suspension footbridge that hangs high above the Mill River.

A 60-foot-tall tower provides unparalleled views of the southern Green Mountains.

A blues musician so talented that people said he must have traded his soul to the devil was born in this house.

This beach provides a glimpse of the ancient seafloor without getting wet.

One of the world’s longest pedestrian suspension bridges.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

A Victorian marvel of engineering is now a 21st-century tourist attraction.

A breathtaking viewing platform over the Alps.

A breathtaking 19th-century trail overlooks Lake Tahoe.

Perhaps the most spectacular grotto along the Algarve coastline.

Hidden amid a collection of trails is the site of a tragic crash.

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

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.

A grove of "candelabra redwoods" deep in California's Lost Coast.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

Sip whey-based vodka at the first Native-owned distillery opened on a reservation in centuries.

This exhibit allows visitors to wander through the interior of a replica Ice Age glacial cave.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

The San Andreas Fault spectacularly offsets this creek.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

This magnificent Japanese garden provides a moment of Zen in rural Vermont.