This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A spiritual vortex among the red rocks in Sedona.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Colorful umbrella-covered trees in Singapore's Little India look straight out of Dr. Seuss.

The library's graceful rotunda is like a bibliophile's temple.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

Tubing through a cave lit with glowworms is a magical underground experience.

Australian Lake set aglow by Noctiluca Scintillans.

The world's largest bioluminescent area was undiscovered by science until 2005.

A massive concentration of algae is responsible for this lake's pink hue.

An Australian lake whose pink hue defies scientific explanation.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

This striking, two-toned confluence of rivers is visible from space.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

A 70-foot-deep ice cave formed by lava from Mt. Fuji on the edge of Japan's "Suicide Forest." 

Featuring one of the most complete and original collections of Presidential memorabilia, this is the site of the last front porch presidential campaigns.

This 700-year-old street food market features baby octopus and soy donuts.

This large midwestern cavern features impressive rock formations and an underground waterfall.