This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

This Swedish automobile graveyard is a beautiful gallery of decay, but woe be to any who would steal a souvenir.

An attractive alpine lake at 8,400 feet that is accessible via a paved road.

Drive up a paved road into "Nevada's Yosemite" for exquisite views and mountain hiking in an alpine setting.

Rare recess caves fill this unbelievably beautiful Ohio park.

A network of tunnels runs underneath the buildings of this ancient village.

A centuries-old iron mine is now a paradise for explorers, divers, and spelunkers.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

This village surrounded by breathtaking waterfalls is one of the wettest places on earth.

Beautiful scenery provides the backdrop for an abandoned coastguard facility.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

A Spanish town built into the cliffs.

A reservation-only highland forest reserve of endangered Pinsapar firs stands above a village in Andalucía.

Once a major stop on the Hejaz Railway, this desert station (complete with steam locomotive) has been abandoned for decades.

The largest cave on the island of Menorca was likely the site of Iron Age rites and rituals.

This colonial mining complex is now home to magnificent themed gardens.

This highly decorated dam is one of Guanajuato's most unexpectedly beautiful public works.

A Christian retreat founded to welcome refugees fleeing from the Nazis during World War II.

Buffalo's abandoned concrete grain elevators are getting a second life.

A natural gas leak provides a flickering flame beneath a waterfall.