America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

An annual extravaganza of Broadway theater memorabilia.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The famous author's cottage hideaway.

Visit the monolithic tomb of America's most famous general.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

The "Seinfeld" diner.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A dilapidated dock tells the story of Titanic's missed arrival.

A palatial former bank building now houses what may be the poshest art venue (and former Tesco) in Belfast.

An unassuming tribute to engineer William Bald and the workers who built one of Europe's most scenic coastal roads.

These barriers stand as stark reminders of Northern Ireland's troubled past.

An unusual manor of stunning beauty, born out of a crippling disease.

Obelisks and stone pineapples in the Irish countryside.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Commonly acknowledged as the only public monument to the Devil himself.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

The largest fountain in Bratislava.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.