Hidden passage, Cornwall / UK (by George Cryer).

Stephens Gap, Alabama / USA (by Jon Ariel).

Bom Jesus do Monte gardens, Braga / Portugal (by Tom Preston-Werner).

The heavenly light in Grubug Cave / Indonesia (by Andrew JK Tan).

Phra Nang Beach Cave, Krabi, Thailand (by Darrell Nieberding).

Contemplating the marvels of Yungang Caves / China (by d.teil).

Entrance to Macocha Propast Abyss in Vyvery Punkvy Nature Reserve / Czech Republic (via jeskynecr.cz). 

The mayan cenotes of Yucatan Peninsula / Mexico (by Alfredo Alanis).

Natural wonders, Devetashka Cave / Bulgaria (by Nasten).

The Beast of Rurutu Island / French Polynesia (by Éole).

Cave at Lighthouse Beach, Eleuthera Island / Bahamas (by jon_beard).

Chedi inside the cave at Wat Suwan Kuha Temple, Thailand (by Jamie Monk).

Yiliang Jiuxiang Scenic Area in Kunming, China (by CHOPIGU).