The ornate miniature mansions were built for Istanbul's feathered residents.

Brain collection and database that narrows the gap between man and animal.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

The world's oldest continuously operating airport was founded by the Wright Brothers.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

The trials and tribulations of marking Poe's grave.

This free, take-a-book shop seems like a trick but isn't.

An astounding collection of medical specimens, including bits of President Lincoln.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

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

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

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

The privately owned cemetery that holds room for Washington's finest when they step down from life.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

An eerie, derelict amusement park in Berlin.

Budapest's Communist-era statues, banished to the suburbs.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The most accurate timepiece in the world.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.