Freedom--Cave (洞穴)

An explorer descends into the Majlis al Jinn cave in Oman. At more than 50 stories deep, it's one of the largest caves in the world. The cavers' mission is to determine if Oman's deep caverns could be safe for tourists to enter.

阿曼的Majlis al Jinn 洞穴，深达50多层楼高，是世界上最大的洞穴之一。

A caver overlooks razor-edged limestone pinnacles sharp enough to kill a man in Borneo's Tardis Cave. Such spires take millions of years to form as water dissolves the limestone. Tardis is one of many caves in Borneo's Gunung Buda, or White Mountain.

婆罗洲的Tardis洞穴里布满了锋利的石灰岩尖塔锥，这是水溶解石灰石之后形成的，过程数百万年。

The deepest known cave pit in the continental United States, Fantastic Pit in Georgia's Ellison's Cave descends 586 feet (179 meters) straight down.

这是世界上已知的最深的洞穴Ellison洞穴，位于美国佐冶亚州，垂直深度为179米。

Containing some 600 paintings, Lascaux Cave in France's Dordogne River Valley is home to perhaps the world's most incredible array of Upper Paleolithic art. Prehistoric artists created the depictions of bulls and other animals on the cave's calcite walls more than 17,000 years ago. The cave—and its artwork—was discovered by a group of teenagers in 1940.

法国的多尔多涅河谷处的拉斯科洞穴，里有600多副旧石器时代的壁画。

A hiker peers out of an ice cave on Mount Kenya's north face. No matter their location, ice caves contain a significant amount of ice year-round.

肯尼亚山的冰穴，这里的冰整年不化。

Ancient Mayans created negative handprints on the walls of what we now call Handprint Cave in western Belize by taking pigment and blowing it on the walls around their hands.

西伯利兹的手印洞穴，这里曾是玛雅人居住的地方。

A caver descends into Hytop Drop, a 98-foot-deep (30-meter deep) pit in the Walls of Jericho, Tennessee. Located near the border with Alabama, the Walls of Jericho is a large, bowl-shaped natural amphitheater, nicknamed the Grand Canyon of the South.

田纳西的耶利哥之墙有一个深达98英尺(约30米)的地下洞穴。耶利哥之墙面积广阔，呈碗状，有南部大峡谷之称。

Meltwater sculpted the dagger-like shaft of ice near a cave in Matanuska Glacier in Alaska's Chugach Mountains. Matanuska is an active glacier, advancing about one foot (0.3 meters) every day.

匕首状的冰山是融水的杰作。这里是阿拉斯加的库加奇山脉群。曼坦奴斯卡冰河非常活跃，每年向前移动约一英尺（0.3米）。

A skeleton from a Maya human sacrifice turns to stone in the Actun Tunichil Muknal Cave in Cayo, Belize. To date, the remains of 14 victims have been found in the cave, also known as the Cave of the Stone Sepulcher.

伯利兹的卡约，有一个 Actun Tunichil Muknal 洞穴。里有玛雅文化时期的人祭品，共14具，已成化石。