A system of constructed rapids and concrete waterfalls in a linear park on the Slepnya River.

A window into the luxurious lives led by the landed gentry of Minsk before the 1917 Revolution.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

She asked for a potato cellar and over the next 23 years he gave her a network of holy caves.

After visiting hours, this picturesque waterfall is essentially turned "off" to be used for hydroelectric power.

Right up until the 20th century this network of man-made caves was the biggest village in Eastern Armenia.

A geological oddity topped with a 2,000-year-old pagan temple.

A museum of tiny buildings in the tiny country of Andorra.

This beautifully preserved Ottoman house is steeped in history.

Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

According to a local legend, this old castle could only be built after a woman was immured in the walls.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A naturally beautiful, seemingly bottomless deep blue spring.

This incredibly diverse research station is one of the largest tropical botanical gardens in the world.

A collection of heirloom roses tucked in a spectacularly beautiful botanical garden on Lake Atitlan.

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

This wildlife refuge is home to more than 200 species of birds, as well as monkeys, lizards, and other wildlife.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

In Costa Rica's cloud forest, the roots of a woody ficus create a botanical bridge.

This Costa Rican topiary park is a surreal garden of unearthly delights.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

A natural swimming hole that was once a ceremonial center for Mayan priests.

An important Mayan religious and trading center dating back to 200 BC.