Medicinal spa created with the discharge from a geothermal energy plant.

A beautiful 62-acre Catholic shrine and botanical garden.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Dramatic river bend surrounds a natural red-rocked pedestal.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

Traditional 15th century Chinese garden in the middle of Vancouver.

Historic psychiatric asylum and most-filmed location in the Great White North.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

This expansive bridge in the Canadian wilderness was originally just built for friends.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

This Elizabethan hedge maze is one of only six in North America.

An old world fairytale-land with over 350 fairy folk figurines hidden amongst 800 year old cedars.

Sip coffee and talk politics at this landmark cafe in Astoria's Little Egypt, a contender for the title of America's first hookah bar.

Neal Cassady may still have an open tab at one of Denver's oldest watering holes.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This former railroad bridge was named after the great river that once flowed below it.

This ''hidden'' 19th-century bridge played a simple, yet important role during the Spanish-American War.

This community-driven organization uses education and eco-friendly technology to protect the environment.

Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

This 20th-century mansion plays a key role in one of Puerto Rico's greatest novels.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

Legend has it this historic port was a popular hideout and smuggling spot for pirates.