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

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

The U.S. Fish Commission’s effort to mass produce carp.

D.C. once had its own tiny rival to the New York Stock Exchange.

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.

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

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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Two stone columns flank the grand Venice square, but there were supposed to be three.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A deep mark on the remains of a Roman temple, believed to be left by a legendary warrior.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.