A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Beneath unsuspecting visitors feet, a capsule containing pieces of America’s civil rights history.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

A much-maligned monument to teetotalism.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

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

There’s a hidden military meme engraved on the World War II Memorial.

An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Rumors persist that a bottle of whiskey is sealed within this Demijohn-shaped adornment.

This historic Victorian hotel has a scandalous history of affairs and murder.

A monument stands at one of the starting lines of the Trans-Canada Highway, formerly the longest uninterrupted highway in the world.

Greenery cloaks this serene sculpture inspired by the famous Lost Gardens of Heligan.

The famous aviator's final resting place is a study in natural beauty.

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

Decorative shell walls built in the 1940s sit atop an ancient midden created by the Calusa Native Americans.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.