The underground world here, the number-one tourist attraction of Barbados, is usually viewed from aboard an electric tram and trailer. You'll see bubbling streams, tumbling cascades, and subtly lit deep pools, while all around stalactites hang overhead like icicles, and stalagmites rise from the floor. Visitors may disembark and get a closer look at this natural phenomenon at the Rotunda Room and the Cascade Pool. Although it's interesting, it may not impress those who have been to the far more spectacular Carlsbad or Luray caverns back in the United States. For those folks, we'd recommend the "Eco-Adventure Tour", which involves donning a hard hat with headlamp, and clambering through parts of the cave that visitors rarely see ($100 for that experience). The latter tour is available by advance reservations only, daily at 9am or noon.