This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

The monster at the center of the Darwin Center Spirit Collection.

Repository for more than 22 million pickled specimens.

A century-old factory reborn as an artist-run live-work building.

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

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

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

Eighty million natural history specimens call this gargantuan museum home.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

One of Ireland's most infamous prisons for rebels including men, women and children.

The oldest public library in Ireland.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."