Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

Less a museum than a bizarre fantasy world created by artists and engineers.

The only museum with its curator—and her pets—buried inside.

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

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Go inside to really appreciate this 500-year-old technological masterpiece.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A beautiful Victorian-era cemetery, complete with a miniature village.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

The celebrated eyesore created by starry-eyed sweethearts.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

There must be a pun in this haystack somewhere...

A bit of retro transportation flair preserved in the world's largest department store.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

One kilometer of thick brass rod laid out before your eyes.

An artist's cute bronze subway sculptures belie his violent artistic past.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Avoid gangster interaction while window-shopping.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

One of only two commuter aerial tramways in the United States.

Mysterious 500-year-old tapestries depict a unicorn hunt.