This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A series of carved figures that scandalized British society.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

London's smallest police station is barely the size of a phone booth.

The television series' iconic giant foot was borrowed from this classical painting.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

Tiny memorials honor individual victims of the Holocaust.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

An Irish Memorial commemorating those who perished due to potato blight.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

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

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

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

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

This elaborate towering structure was once famed for its revolutionary height.