A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Hill-like structures formed by glaciers and sandy spits of land.

Trash escaped from a landfill to fill beaches with all kinds of treasure.

Solar powered Spectacle Island features all-green facilities.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

The world's largest piece of copyrighted artwork.

The bears may be gone, but their old cages can still be found.

A beautiful Victorian-era cemetery, complete with a miniature village.

Radical Bookstore and Community Space.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

One of America's most historic homes also holds a startling literary legacy.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

Caligula's colossal pleasure ships, discovered by Mussolini only to be lost in flames.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Pompeii's less famous neighbor is still revealing her secrets.

The oldest volcanology research center in the world.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

The site of Paul Revere's historic two lantern warning.

This landmark cemetery in Boston was created more than 300 years ago.

Narrowest house in Boston.