This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The largest source of fossilized insects anywhere.

At the supposed instruction of Ben Franklin and Socrates, a Spiritualist believer intended to birth a mechanical messiah here.

A historic custom house with ties to George Washington is now a shrine to local nautical history.

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

An eccentric inventor's castle home with its own indoor weather system.

According to legend, the Devil left a footprint behind after an epic showdown with a traveling priest.

These craggy limestone outcrops offer a glimpse at a unique piece of Florida geology.

A gleaming white tower in ornate Indian style soars above the low-slung bungalows of north Tampa.

This stimulating sex toy museum is sure to arouse the interest of its visitors.

Plans for this peninsula included houses, the United Nations Headquarters, and a nuclear power plant. When none of them worked out, it became an expansive park.

One of the now-less-hidden floral gems of the "Emerald Necklace."

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

This canyon is comprised of gorgeous waters and magnificent basalt columns.

The bright red stripes streaking across the rocks are the star feature at this Icelandic waterfall.

This former factory has been transformed into a technicolor wonderland, where dozens of local artists have collaborated to create a real choose-your-own-adventure experience.

Fascinating military history, awe-inspiring wildlife encounters, and endless outdoor adventures draw people to this sprawling park.

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

More than 12,000 years ago, this park was a playground for mastodons.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.