A monument to one of the few Olympic flames ever to be lit outside of the host city.

This kitschy tavern is also home to rare early editions of "Treasure Island."

The original Garfield station is the oldest station facility on the "L", with the station house dating from 1892.

Also known as the Osaka Garden, this garden was originally built in 1893 as part of the World's Columbian Exposition.

The sun acts as a key that only fits this giant keyhole twice a year.

Go take a picture with the inventor of the daguerreotype photographic process.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

A priceless collection of the Nation's cryptologic history.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

The first green space constructed on an elevated viaduct.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

The solemn exterior conceals an opulent interior of this 17th century church.

Museum devoted to the artificial language of Esperanto.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

The Habsburgs' royal collections of art and wonders.

Baroque celebration of the end of the Great Plague of Vienna.

Handsomely crafted representations of our round planet.