South Korea's only sex-themed park.

This amazing ancient cave was kept secret for seven years to protect it from the public.

You can row a boat through this ancient underground reservoir.

This unique formation is characterized by hexagonal basalt rocks stacked in unique formations.

Nearly three tons of weapons from the Vietnam War still remain in this small, hidden museum.

A desert in southeast Asia, complete with a beautiful lake covered in lotus flowers.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

World's largest cave was only discovered in 1991, and now offers tours to the public.

An on-site urban farm and fish pond supply some of the produce for this upscale restaurant.

Thailand's distressed elephants find peace at this Chiang Mai sanctuary.

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

Stunning wetlands ablaze with pink lotus flowers.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Singapore's landscaping project is home to 18 incredible Supertrees.

The romantic botanic tunnel feels like a well-kept secret.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This massive underground salt mine now holds a sci-fi theme park in its depths.

The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

Monasteries on rock pillars, once accessible only by frayed ropes.

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

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.