The metal leaves on this tree are engraved with the names of Holocaust victims.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

A dilapidated dock tells the story of Titanic’s missed arrival.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

19th century cemetery hidden in Brooklyn's Prospect Park.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

This neo-Gothic former auto showroom is one of the few remaining reminders of Brooklyn's "Automobile Row."

These craggy limestone outcrops offer a glimpse at a unique piece of Florida geology.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.

This weeping, 10-foot-tall sculpture was a maquette for a 9/11 memorial.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

These ruins of an octagonal stone school that was later used as an A.U.M.P. church exemplify a popular school design from the 1830s.

The longest covered bridge in Delaware.

One of the oldest of its kind.

Featuring the the longest lift span of any vertical-lift bridge in the world.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

This tiny museum's sizable collection is jammed into a former underground public toilet.

This black church sits alone among a field of lava rock.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

Europe’s most powerful hot spring supplies the surrounding region with hot water.

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

This elegant arc of a waterfall marks a religious turning point.