Beautiful mosaics cover the first stations opened on New York City's newest subway line.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

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

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

Connecticut grave of the woman responsible for the Winchester Mystery House in California.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

It's a mystery why these remains were found with no traces of their bodies in sight.

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

A daily replay of the experiment that proved the rotation of the Earth.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

The final resting place of a famous 19th-century murder victim whose identity is still a mystery.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

The famous author's cottage hideaway.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

A measuring mishap led to these artificial stone ladies losing their stomachs.

An ornate aviary built during the Victorian trend of collecting exotic birds.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.