The site of the deadly Triangle Shirtwaist Factory Fire.

The oldest living tree in Manhattan comes shrouded in sinister legend.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

Concrete strongholds stand guard over the Golden Gate.

An abandoned, unfinished mansion on grounds strewn with lava rocks.

A modern mechanical planetary system, part of a 10,000 year clock.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

This shop specializes in oddities and Victorian-inspired wonders.

A tribute to Ponce de Leon's supposed quest for eternal youth.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

This lovely pocket park is one of the most under appreciated in D.C.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

A massive sustainable farm designed by the mastermind behind Central Park.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.