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“In the brilliant light of the tropical sun, the sea surface, dark and light, here and there in the shadow of limestone mountains, is really an indescribable, fanciful scene. Sunset looks like a flaring fire, throwing all the islands into a fairyland.” French Journalist John Rey describing Halong Bay
Belize ... This is called the ATM Tour or ATM Cave. It's amazing, you swim in with headlamps on and climb rocks and ladders to get to different levels. On each 'platform' you observe different artifacts. It's pitch dark inside with flowing water. Once in a lifetime tour, there are 25 guides that go through special training to be allowed to take tourists in the cave.
Padirac cave, France The Padirac Chasm or Gouffre de Padirac is a cave located near Gramat, in the Lot département, in France. The chasm itself is approximately 99 m (325 ft) around its rim with a diameter of approximately 35 metres (115 ft). Visitors descend 75 m via a lift or a staircase before entering the cave system. The cave, at a depth of 103 metres (338 ft), contains a subterranean river system that is partly negotiable by boat.