More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

A unique set of caves that spits waves back out into the ocean.

This unusual lava tube spouts seawater during high surf.

This ancient Hawaiian henge may have been an early star chart.

Get up close and personal with these majestic fish.

A controversial memorial at the place where Captain Cook met his violent end.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

Race through the maze, get your name on the sign.

A remarkable lava formation encloses a line of Buddhist statues that can't be accurately counted, according to local mythology.

This long-distance walking route follows the Prime Meridian line as it passes through England.

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

These quintessentially English stepping stones were built for Victorian tourists.

The longest manmade tunnel in Queensland is now a beautiful trail, home to a special colony of bent-wing bats.

A breathtaking 19th-century trail overlooks Lake Tahoe.

This trail follows unique stone railroad tracks and a historic waterway to the south coast of Devon.

A dictator's failed public works project has been reborn as two linked trails through spectacular scenery.

The longest non-mortared wall in the country is one man's tribute to his displaced Yuchi ancestor's five-year journey to her homeland.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.