Several plaster noses are hidden in plain sight around London's Soho neighborhood.

This lab's maddening silence is good for business but bad for sanity.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

New York City's smallest piece of private property.

One part local history, 99 parts gruesome haunted house.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

World-famous, Pink's still manages to keep its prized cult fetish status.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

The ghostly remains of an accidental sea.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

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

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

The world's longest known cave system.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This naturally-sourced hot spring is now home to a clothing-optional resort.

Hidden beneath the streets of London is a secret subway that only carried mail.

A tongue-in-cheek arcade where the games are based on everyday life.

Olfactory delights in San Francisco's Botanical Gardens.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.