Unrepaired walls from a 1920 anarchist bomb attack.

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

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

35,000 grape hyacinths flow like water down a garden hill.

This delicate museum is devoted to the art and industry that once supported Cape Cod's oldest town.

This candy-colored storybook village originated as a 19th-century Methodist campground.

This lakeside tower is the third attempt at getting a tourist destination to stick on the spot.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

This strangely amalgamated museum explores the history of the Timex clock company as well as archaeology.

A museum dedicated to antique toys, collectibles, and nostalgia.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

A miniature village lies nearly forgotten in the forest by the side of a major highway.