A gothic church spire sits atop this skyscraper, the tallest church in the world.

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

A popular rock that acted as a waymarker for American pioneers.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

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

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

This black shoreline is made up of exploded lava particles.

A tunnel of hardened lava along Maui’s famous Road to Hana.

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

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Native Americans built this circle of stones, which was used to predict astronomical events.

The unbelievably opulent home built for an infamous newspaperman.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

This popular pilgrimage site offers a hole filled with holy healing dirt.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Remember that scene in the Matrix, when Neo is in the big white room with all the weapons flying by? Well, this is what it would look like if he had wanted trees instead of guns.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

Years of archaeology, just chillin' by the water cooler.

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

These pretty kitties killed and ate as many as 135 railway workers.

Every plane, auto, and bicycle in this collection is kept in working order and are regularly demonstrated to the public.

The summer home and later final residence of acclaimed American sculptor Augustus Saint-Gaudens.