A tiny plaque marks the location of the water source that facilitated the birth of modern-day Boston.

Stolen goods adorn the organ at Old North Church.

A centuries-old church stands as a testament to Boston's "father of architecture."

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

This "life-size" depiction of Mickey Mouse as a half-lobster is both whimsical and a bit creepy, standing guard over the Boston waterfront.

This impressive Boston holy house is the American mecca for Christian scientists.

An enormous, inside-out glass globe built in 1935.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

Painstakingly built dioramas sit unnoticed in a Boston office building.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

Monasteries on rock pillars, once accessible only by frayed ropes.

The hallucinogenic center of the ancient world.

This legendary city has been a tourist attraction for centuries.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A more chill but no less fascinating version of the famous ancient archeological site.

Oldest Protestant church in the Middle East, designed to resemble a synagogue.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

A "miracle" that seems to produce more holy fistfights than holy revelations.

An ancient quarry rediscovered by a dog and claimed by biblical kings, a German cult, and the Freemasons.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.