One of the most well-preserved temples of ancient Egypt.

An endless sea of white conical domes.

An alien landscape of chalk-rock in the Egyptian desert.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

Slum Settlement Filled With Mountains of Garbage.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

The first memorial dedicated solely to the Black troops who fought for the Union.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

Washington's iconic carousel has a nice piece of Civil Rights history.

The towering figures were created from the cemetery's fallen old-growth trees.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

The walls of the iconic dome are hollow and have a secret stairway.

A nostalgic bibliographic gem.

People escaping slavery may have hidden inside a corpse vault.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The only thing better than tubing down New Jersey's scenic Delaware River is doing so while eating a hot dog from a giant floating stand.