The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

A small part of lower Manhattan is actually made from a bit of England.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

On this island, you suck away your garbage via an elaborate pneumatic tube system.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

The first green space constructed on an elevated viaduct.

This metal eagle one of the final remnants of a newspaper that wanted to keep Brooklyn to Brooklyn.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

Nope, not Washington Irving's house.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

The only remaining building in New York to see the inauguration of a president is being slowly overtaken by a grocery store.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

The last bastion of Roman presence north of the Alps looms over a German town.

A unique underground structure dating back to the 1st century BC.