London is among the world's most visited cities, with countless attractions and a history stretching back two millennia. Visitors will discover historic iconic structures like Westminster Abbey, Big Ben, and Tower Bridge, as well as recent marvels such as London Eye, a giant observation wheel that offers breathtaking views of the whole city.

Some of the most spectacular scenery is found on a trip to the San Juan Islands. No wonder. This 100-million-year-old mountain range turned archipelago, located a few miles northwest of Seattle, changes dramatically with the tide. There are 743 islands at low tide--and 428 at high tide.

Rovaniemi, located just a few kilometers south of the Arctic Circle, is widely recognized as the official hometown of Santa Claus. From late August through early April, the Northern Lights are visible on clear nights, and several local guides offer nighttime tours to remote locations for optimal viewing. During summer, the sun doesn't set for weeks, giving travelers the rare chance to hike or kayak under a sky that stays bright at midnight.

Khao Yai National Park is one of the most interesting and oldest park in Thailand. It is northeast of the central plain of Thailand, on the rim of the Korat Plateau. There are many species of plants and animals. Large animals such as wild elephants and tigers prowl the jungles freely. More than 800 species of orchids grow there and over 200 species of day moths have been catalogued.

Set along the shoreline of St Kilda, Victoria, Australia, this seaside suburb offers a relaxed coastal setting just minutes from central Melbourne, Victoria, Australia. Its wide promenade, lined with palm trees, draws both locals and visitors who come to walk, cycle, or simply watch the bay. The historic St Kilda Pier stretches into the water, offering open views of Port Phillip Bay and a steady breeze that carries the scent of salt and sea.