Ride a boat through this magnificent underground world, which now doubles as a theater.

Mysterious heaps of stones dot these otherworldly woods.

An enormous, 30-story-deep hole in the middle of Guatemala City.

One of the world's largest pyramids stands within El Mirador, the "lost city of the Maya."

Natural saunas fed by volcanic heat.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

The remnants of an archaeological camp stand within Tikal National Park.

One of the world’s most colorful cemeteries, where each pigment is symbolic.

These small, triangular, colorful houses are a staple of Madeira Island.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

This lovely little pond is named after the hundreds of soldiers' corpses that were rolled into the waters during the French-Indian War.

This throwback amusement park is home to rides and unique storybook figures from the past.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

Rare recess caves fill this unbelievably beautiful Ohio park.

The ballpark in "Pigtown" where the Brooklyn Dodgers made their name was replaced with a huge apartment complex.

The flagship building of an early national restaurant chain is a superb example of terra cotta art.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

America's only city hall with minarets took architectural cues from Ali Baba and the Forty Thieves.

Former villa and estate of James Deering developed to preserve native tropical forests.

This beautiful Miami garden was designed as a laboratory for tropical plants.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.