A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

A bit of retro transportation flair preserved in the world's largest department store.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

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

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

The London statue that imitates passersby.

Black cat statues guard this temple-like Egyptian revival factory.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

A museum wholly devoted to juvenescence.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

A famous burial ground with a history both grim and literary.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

Eighty million natural history specimens call this gargantuan museum home.

The anatomical-pathological collection of a man who changed surgery.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

The curios of pharmacist and collector Henry Wellcome.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

A student driver's nightmare.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.