These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

An ancient Egyptian temple in the middle of Madrid, Spain.

A Spanish town built into the cliffs.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

One of the world's tallest flagpoles.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

This public park was the site of the largest civilian disaster of the Civil War.

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

The god of wine stares out at passersby on this busy Pittsburgh thoroughfare.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

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

A touching tribute to the "Queen of Soul."

This former water source for the City of Brooklyn is now a thriving natural wetland.

One of the largest public housing complexes in New York once visited by Eleanor Roosevelt.

2 square block factory in Greenpoint erected in 1936.

The only remaining Jewish congregation in Greenpoint.

This unusual apartment building may be Brooklyn's own version of the Leaning Tower of Pisa.

Neoclassical bank designed by NY architects Helmle & Huberty.