The Darvaza Gas Crater, famously nicknamed the “Door to Hell,” is one of Turkmenistan’s most extraordinary landmarks. Located deep in the Karakum Desert, this fiery pit has been burning continuously since the early 1970s, when Soviet engineers reportedly set fire to a collapsed natural gas field to prevent the spread of methane.

Framed by an array of tropical flowers, "miniature" houses painted in a pastel palette will enchant you. But, a splash of watercolors is all you'll see as you zip by on a moped. It won't be long before you find the perfect spot for a beach picnic and afternoon of snorkeling.

Virginia is a state where past and present share the same ground. In places like Colonial Williamsburg, costumed interpreters walk the same streets once frequented by American revolutionaries, while nearby Jamestown and Yorktown complete what's known as the Historic Triangle. Outside its historic corridors, Virginia surprises visitors with its changing landscapes, from the rolling horse farms of Middleburg to the rugged terrain of the Blue Ridge Mountains.

The Great Barrier Reef stretches along Australia’s northeast coast, forming the largest coral reef system on Earth and one of the planet’s most complex living ecosystems.

Bulgaria is a republic in southeastern Europe. The capital and largest city is Sofiya. Bulgarian culture has been influenced successively by Byzantine, Greek, Russian, and Western cultures.