This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

The remains of this medieval Roman road and lookout towers dot the rugged coastline of southern Lazio.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

Tracing a path of more than four miles around a frozen lake, this is the longest skate trail in the United States.

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

Each year melting snow turns these Austrian hiking trails into scuba zones.

When the rain falls, this drain system turns into a musical instrument.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

The home of a 19th-century author who brought African-American folktales to the mainstream is now Atlanta’s oldest house museum.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

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

Ado Awaye Mountain and the unique lake that sits near its peak are shrouded in ancient legends.

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

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

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

This 19th-century island fort built to protect against an invasion by sea.

Take a stroll through this centuries-old tunnel of enormous moss-hung evergreens, nestled among the grounds of America’s first public sculpture garden.

A delightful architectural wonder awaits on a lake island in Kuala Lumpur’s oldest park.

An enormous, inside-out glass globe built in 1935.

This wondrous hideaway is suspended in a bamboo forest above a sanctuary for rescued llamas and alpacas.

Eat like a bird in a bamboo nest.