A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The sculpture of the deceased cockatoo flops atop its personal plinth.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

Site of one of World War I's most horrific scenes.

A memorial to the soldiers who died in the bloody battles to control Verdun in World War I.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

The tallest monument in a historic New Orleans cemetery was prompted by romance and dash of pettiness.

A monument to a survivor of harsh pioneer life, frostbite, and primitive surgery.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

The extensive collection of an amateur naturalist.

Where a guard killed nine German prisoners during one of the worst 20th-century POW camp massacres in U.S. history.

This institution pays tribute to an associate justice who protected civil rights and prosecuted Nazis.

The first park built over a freeway is a brutalist masterwork.

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

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Home to items never before seen by the public.

Memorial built in 1922 in remembrance of WWI casualties.

The creek where a shark wreaked terror upon New Jersey, and served as the inspiration for "Jaws."

The final resting place of many of New Jersey's most famous residents, including U.S. history's most in-vogue antagonist, Aaron Burr.