The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This beautiful, historic church looks like something out of a simpler past.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Medicinal spa created with the discharge from a geothermal energy plant.

This Upper East Side apartment co-op was designed as a tuberculosis sanitarium.

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

The home of the first American-born saint is one of the only curved buildings in New York.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

A Yiddish theater turned movie house turned rock and roll landmark turned gay disco turned bank.

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

Monument to a forgotten NYC disaster that claimed the lives of 1,000.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

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

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

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

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

There are owls with glowing eyes in Herald Square.