Kẻ Bàng National Park lies in central Vietnam, near the border with Laos, and is known for its vast network of limestone mountains and underground rivers. The park forms part of one of the oldest karst landscapes in Asia, shaped over millions of years into a maze of caves, cliffs, and dense forest. Among its most famous features is Sơn Đoòng Cave, recognized as the largest cave on Earth, with sections so vast that clouds can form inside and a jungle grows beneath its collapsed roof.

Cameroon is often called “Africa in miniature” for good reason. Within its borders, travelers can explore coastal beaches, dense rainforests, vast savannas, active volcanoes, and snow-capped peaks, all without crossing a border. The country’s most iconic landmark, Mount Cameroon, is the highest mountain in West Africa and an active volcano that draws hikers from around the world.

Settled in 1769, this Maine city is located on the Penobscot River in south central Maine.

Touba is a major religious city in central Senegal and the spiritual center of the Mouride Muslim community. Located in the Diourbel Region, the city is dominated by the Great Mosque of Touba and the mausoleum of Sheikh Ahmadou Bamba, founder of the Mouride order.

Devil’s Bridge National Park, located on the rugged Atlantic coast of Antigua, is one of the island’s most dramatic natural landmarks. The park is named after its striking limestone arch, carved over centuries by relentless waves and wind.