Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

It is said a heartbroken man visited the gap every day to stare blankly out at the sea.

The lake that fills and empties itself at random.

Northern Ireland's Brobdingnagian stepping stones.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

These murals stand as reminders to the troubled history of this Northern Ireland city.

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

A classic carnival ride that was carved to be untouchable.

A smoke stack so large, the Washington Monument could fit inside!

The only road through the heart of Glacier National Park.

A natural swimming hole that was once a ceremonial center for Mayan priests.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

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

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.

These azure waters were thought to lead to the Mayan Underworld.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

60 feet of towering steel balances gracefully.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.