Located on the Big Island, Hawaii Volcanoes National Park is home to a fiery duo: Kīlauea and Mauna Loa, two of the world’s most active volcanoes. The UNESCO World Heritage Site is a must-visit attraction, covering a geologically diverse 523 square miles (1354.5 square kilometers) with everything from ash-covered deserts to lava tubes awaiting exploration. For a wheelchair- or stroller-accessible hike, try the Kūpinaʻi Pali portion of the Crater Rim Trail, also called the Waldron Ledge. The trek is approximately 1 mile (1.6 kilometers) long and rewards visitors with stunning views of the Kīlauea Caldera, a roughly 280,000-year-old volcanic crater, along with the Halema’uma’u crater, which collapsed in 2018. Visitors sometimes call it the Earthquake Trail to mark the falling rocks and deep cracks from the 6.7 magnitude quake that occurred on the island in 1983.

Located about 90 minutes north of Denver, the picturesque Rocky Mountain National Park (RMNP) beckons with 355 miles (571 kilometers) of hiking trails for an unforgettable day trip. Known for its 60 mountain peaks and more than 100 lakes, RMNP is popular year-round. Visitors come to view the fall foliage, experience the fragrant spring wildflowers and take in the summer vistas. Opt for the serene hike to Dream Lake, which offers views of the deep sapphire water, aspen groves and ponderosa pines. Or challenge yourself with a trek to the summit of Flattop Mountain, a rugged trail that reaches an elevation of more than 12,000 feet (about 3,656 meters). Bring your camera to snap pictures of the area’s thriving wildlife, which includes bighorn sheep, elk, mountain lions and various endangered species like the Mexican Spotted Owl or the North American Wolverine.

Just 27 miles (44 kilometers) outside of Reykjavik lies an otherworldly UNESCO World Heritage Site — and frequent filming location for hit TV shows — that is sure to impress even the most seasoned hiker. Once inside Thingvellir National Park, head to the Almannagjá, a visible rift between the North American and Eurasian tectonic plates, which continue to move apart at about 0.8 inches (2 centimeters) per year. Thrill-seekers can bundle up and dive between the two continents via the Silfra fissure, a deep crevasse filled with glacial water. After your day of adventure, unwind at the centrally located Iceland Parliament Hotel, Curio Collection by Hilton. With a full-service spa that includes a sauna and steam room, it’s the ideal spot to recharge after a day of outdoor adventure.