This southern Mexican state borders Guatemala. Its mountainous highlands and dense rainforest are dotted with several Mayan archaeological sites and Spanish colonial towns.

In Edinburgh, an ancient fortress looms, the hills are steep, and travelers delight in the hidden charms of the Old Town and New Town. Hike to find spectacular views on Arthur's Seat, shop the downhill streets of the Royal Mile, and visit Edinburgh Castle, an imposing royal fortress that defines this city's skyline.

Tongatapu, the main island of Tonga, is where tradition, history, and the South Pacific’s natural world intersect in quiet and unexpected ways. As the political and cultural center of the Kingdom of Tonga, it is home to the capital city, Nukuʻalofa, as well as ancient royal burial grounds, dramatic coastal blowholes, and friendly villages where daily life unfolds slowly.

The continent lying mainly within the Antarctic Cirle with the South Pole approximately at its center. The Antarctic Treaty of 1959, signed by 12 countries prohibits military activities and promotes the exchange of scientific information.

Sukhothai, located in north-central Thailand, was once the capital of the first independent Thai kingdom in the 13th century. Today, it’s best known for the Sukhothai Historical Park, a UNESCO World Heritage Site filled with stone temples, lotus-filled moats, and ancient Buddha statues. The park spans over 70 square kilometers and features more than 190 ruins.