Dedicated to nine marines from Massachusetts who perished during the Beirut bombings.

Former home of an abolitionist couple who escaped slavery and established the most active Underground Railroad stop in Boston.

A memorial dedicated to victims of the Irish Potato Famine who perished while quarantined on this island.

A dedication plaque on this Boston tunnel is a microcosm of a massive, controversy-laden construction project.

A 150-square-foot masterpiece of American landscape art is the crown jewel of this library and art gallery in Vermont.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

London's smallest police station is barely the size of a phone booth.

This coffee shop lies hidden beneath a historic church.

A memorial for public executions that dates back to the 14th century.

Murals of the wild parties once held on the frozen River Thames.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

A recently restored Shoreditch landmark with ties to Jack the Ripper.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Explore nearly 400 years of English middle-class home life.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

Artists and musicians now rule over this former rail station.

A building that survived WWII, possibly on the virtue of its name alone.

Preserved behind glass, the ruins of a medieval building used to store human remains.