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Rare cave pearls fill dried-out terrace pools in Hang Son Doong, Vietnam. This unusually large collection of stone spheres formed drip by drip over the centuries as calcite crystals left behind by water, layered themselves around grains of sand, enlarging over time.

Ropey lava flow. Fernandina Island, Galapagos Islands, Ecuador.

Grand Canyon Glass Bottom Skywalk, Arizona NOOOOO way... I would freeze in my tracks, starve and die right at the first place I looked down eeeeeeeeK but pretty dang cool too .. wish I could

By Amstrad. The queen's head rock, it's in Taiwan. :)

↑ Jordan — Meandering wadis combine to form dense, branching networks across the stark, arid landscape of southeastern Jordan. The Arabic word "wadi" means a gully or streambed that typically remains dry except after drenching, seasonal rains. Image courtesy of USGS National Center for EROS and NASA Landsat Project Science Office.

Kamchatka Peninsula— The eastern side of Russia's Kamchatka Peninsula juts into the Pacific Ocean west of Alaska. In this winter image, a volcanic terrain is hidden under snow-covered peaks and valley glaciers feed blue ice into coastal waters. Image courtesy of USGS National Center for EROS and NASA Landsat Project Science Office.

The underground rivers at Xcaret in the Mayan Riviera in Mexico!

Tide formed "Zen Garden" Photo by quinet