Experience Earth’s extreme natural features on these day hikes to singing sand dunes, live volcanoes, ice caves, and a boiling lake.

Tire-Bouchon Pass, Taghia, Morocco

Length: Six miles (9.7 kilometers) one-way from the end of the road in Zawiya Ahansal to the village of Taghia. In Taghia, the top of the Tire-Bouchon lies more than 1,640 feet (500 meters) above the village center and can be reached in one to three hours.

Wow Factor: Trek into one of the hardest spots to reach in North Africa.

Mendenhall Ice Cave, Juneau, Alaska

Length: Eight miles (12.9 kilometers) out and back, plus paddling

Wow Factor: Hike underneath a glacier.

Boiling Lake, Morne Trois Pitons National Park, Dominica

Length: 16 miles (25.7 kilometers) round-trip

Wow Factor: Peer into the bubbling cauldron of one of the largest hot springs on the planet

Mingsha Sand Dunes, Dunhuang, China

Length: Six miles (9.7 kilometers) round-trip

Wow Factor: Hear the music of the desert.

Isla del Sol Traverse, Bolivia

Length: Six miles (9.7 kilometers) one-way

Wow Factor: Check out sweeping views of the Andes from a lonely island in the middle of the highest navigable lake on Earth.

Trift Bridge, Gadmen, Switzerland

Length: 3.5 miles (5.6 kilometers) long

Wow Factor: Stare into a receding glacier and hang above the abyss on the longest suspension bridge in the Alps.

Half Dome, Yosemite National Park, California

Length: 17 miles (27.4 kilometers) round-trip

Wow Factor: Hang on for dear life to “hike” to the top of a big-wall climbing objective.

Caves and Broken Top Loop Trails, Craters of the Moon National Monument, Idaho

Length: 1.6-mile (2.6-kilometer) loop and 1.8-mile (2.9-kilometer) loop

Wow Factor: Scramble through lava tubes and around volcanic formations in one of the most inhospitable landscapes in the American West.

Mount Bromo, Bromo-Tengger-Semeru National Park, East Java, Indonesia

Length: Six miles (9.7 kilometers) round-trip

Wow Factor: Climb to the rim of an active volcano.

The Wave, Paria Canyon, Arizona-Utah

Length: 12 miles (13.3 kilometers) out and back

Wow Factor: Find the most unique and lovely feature carved into red sandstone desert canyons.

Source: 10 Hikes to See Extreme Nature