The National September 11 Memorial in New York City exists to remember the 2,977 people who died in the terror attacks on September 11, 2001, and the six people who were killed in the World Trade Center bombing in 1993. Identical pools that span nearly one acre each replace where the Twin Towers once stood, and feature the largest man-made waterfalls in North America.

9/11 Memorial

Acadia National Park is 47,000 acres of recreational land on Maine's Mount Desert Island, a mostly mountainous wooded and beachy area, and home to the highest rocky headlands on the Atlantic coastline. Every year, more than 3.3 million visitors go birdwatching, boating, camping, hiking, and mountain climbing.

Acadia National Park

A 15-minute ferry ride from San Francisco, Alcatraz is a 22-acre island with an abandoned federal prison and the oldest operating lighthouse on the West Coast. A filming location for many movies, it was also the site of an 18-month historic occupation by Native American activists called Indians of All Tribes.

Alcatraz Island

This sandstone canyon located on Navajo land near Page, Arizona is extremely popular with photographers because of the tranquil shapes in the rock formed by flash flooding. Tall, narrow corridors catch beautiful beams of direct sunlight in the upper canyon, and the entrance is at ground level, which means that climbing is not required.

Antelope Canyon

Arches National Park is in Eastern Utah has more than 2,000 sandstone structures, and has the highest density of natural arches in the world, including the Delicate Arch seen on Utah license plates. Adventurers enjoy its 76,000 acres for backpacking, biking, camping, hiking, horseback riding, rock climbing, stargazing, and more.

Arches National Park