Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

The unbelievably opulent home built for an infamous newspaperman.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

The collection of 80+ pieces created between the years 1100 and 1500 is intended to be seen, heard, smelled, touched, and tasted.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

One of the last Jazz Age "Wonder Theaters" in New York City.

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

The original Garfield station is the oldest station facility on the "L", with the station house dating from 1892.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

All of Chicago's wood-paved streets are long gone but two alleys remain.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

Abandoned since the 1950s, the streetcar lane beneath the heavily trafficked bridge lays empty and unused.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

The evolution of recreational vehicles and motorhomes is on display in the “RV capital of the world."

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

A house and yard adorned with bizarre concrete sculptures in a Milwaukee suburb.

A grove of colossal man-made flowers built to collect the sun's rays.