Island where motor vehicles are banned -- home to the only carless highway in the United States.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

This freshwater spring fills with 10,000 gallons of water per minute.

Every equinox this Maya pyramid puts on a spooky ancient light show.

This blowhole is supposedly caused by a trapped monster.

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

This huge pile of volcanic boulders hides a stunning network of secret grottoes.