Shaped like a big top tent, this memorial honors the victims of a terrible train wreck.

A devilishly named gorge that was a sign of salvation for many pioneers.

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

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

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

There's a crumbling old mansion inside the Smithsonian National Zoo.

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

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

Home to items never before seen by the public.

A freedman baker’s lavish tomb has a relief showing various stages of Roman bread making.

A plaque on the base of this statue holds a bewitching design.

This sculpture of a rhinoceros suspended above a city square is meant to evoke the weight of the human condition.

Legend says the only thing buried within this magnificent tomb was a dog.

Turtles swim in a pond surrounding a classical temple in this lush park in Vicenza.

This building was designed to celebrate Italy's victory in World War I.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

A gorgeous example of 13th-century Gothic architecture.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul."

An ancient Roman temple first dedicated to an emperor's wife is now a church.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.