Tens of thousands of tiny birds swarm into one school chimney every fall.

This sandstone mansion was the home of two of Oregon's most important pioneers.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

Scotland's first Masonic lodge may also be the oldest in the world.

A giant, bloody battle rages throughout the Bolivian Andes each year.

Largest site of dinosaur footprints ever found includes more than 5,000 tracks.

Mountain of unimaginable riches that bankrolled the Spanish Empire, complete with its own underworld god.

This hotel is located on the edge of the world's largest salt flat and is made out of the only material around.

A seemingly endless landscape of pure salt stretches far across Bolivia.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

This abandoned sea fort has become an accidental bird sanctuary.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

A priceless collection of the Nation's cryptologic history.

Who is this marble man, perpetually creeping up the steps of his own mausoleum?

The highest peak in the state of Vermont has some interesting features.

A gardener's enduring labor of love is spread throughout a small Vermont town.

The monument dedicated to Phineas Gage in the town where his accident happened.

Two distinctive homes on a New England village green look like a couple of frosted wedding cakes.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.