A swing to dangle you off the very edge.

Rippling sand dunes frozen in the Arizona rock.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A terrific purveyor of natural history objects and curios.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The rocks in this arid basin leave trails of movement behind them.

A fiery crater has been burning in the Karakum Desert since 1971.

An emerald-green grotto just a short trip from Austin.

A giant pineapple, a symbol of hospitality, and an amazing vacation rental option.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Handcrafted thermal spa washes away each night with the tide.

One fisherman has used his love of pebbles and shore to create a crazy garden of rocky art.

Public access to clean drinking water was an instant hit among the masses.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Northern Ireland's Brobdingnagian stepping stones.

This black shoreline is made up of exploded lava particles.

Amöneburg is a town perched on top of a basalt mountain in the middle of an ancient meteor crater.

Legend says that these tall basalt pillars are the petrified wives of a trickster god.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

Two waterfalls flow down the cliff faces decorated with rare natural basalt columns.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

Towering basalt columns, a creation of fire and ice.