The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

The longest fence in the world stretches over 3,000 miles to keep the dingoes out.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

Bomb tests and sheep ranchers share the world's largest military land base.

One of the most unusual geological features, recognizable from a dozen hit movies.

Once a year, at exactly 11:11 a.m., this monument comes to life.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

A geological mystery on Camelback Mountain.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

A towering bronze statue memorializes the founding father of postwar American conservatism.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.