One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This stunning concert hall has become a symbol of Iceland's national recovery.

A relatively obscure antihero from the Marvel Comics universe adorns a wall inside Iceland's main airport.

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

Captain America, Sub-Mariner, and the Human Torch were all born in this art deco Manhattan masterpiece.

This secluded ruin was once a home for exotic plants.

The site of a fallen tree that protected Americans from British forces during the American Revolution.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

Detailed facade of a brownstone in Boerum Hill.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

Costa Rican accommodation resembles a crash site, but with a nice balcony.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

The first museum in the United States dedicated entirely to posters.

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

Holding the most bodies of any cemetery in the United States.

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

The only subway station in the city that still makes use of gap fillers.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

An ever-evolving wall of graffiti art off East Liberty Street.