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

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Cold war icon and onetime "hole" in the iron curtain.

The embalmed remains of the communist leader lie within a custom crystal coffin.

This "railway" for boats continues a waterway over a road.

A space-age 1950s pavilion on a secluded path is full of Toronto history surprises.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

These strikingly barren, rolling red hills were caused by bad farming practices.

This natural sea cave hides a small wonderland of natural turquoise beauty.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

Washington's iconic carousel has a nice piece of Civil Rights history.

The most accurate timepiece in the world.

Home to items never before seen by the public.

The 28-foot granite map plots the locations of 40 theaters in New York City.

Cheap pizza and all of your naughty bedroom needs housed in a stunning example of Art Nouveau architecture.

The first piece of public art dedicated to LGBT rights.

There are owls with glowing eyes in Herald Square.

A modern addition to the Greenpoint skyline.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.