Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Along a coast that sees the annual migration of humpback whales, a geological formation that takes the shape of a whale’s tail.

This 46-foot-tall carving of a legendary Māori navigator can only be visited by boat.

This garden boasts a magnificent collection of orchids and a spectacular view of the surrounding valley.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Few of the many visitors to this resort town know of its hidden Maya ruins.

This beach provides a glimpse of the ancient seafloor without getting wet.

The world's first fully-fenced urban ecosanctuary is a haven for New Zealand's rare and endangered species.

The world's only complete colossal squid specimen is on display at the Te Papa Museum.

Referred to as "the crappiest fountain ever," this sculpture has been splashing unknowing passersby since 1969.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

The "dragon babies" of southeastern Europe.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

A whimsical bridge adorned with decorative dragons.

A public work of art that also provides some relief from the summer heat.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.