A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

The "world's smallest volcano" has been used to store meals and dispose of dead bodies.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

A Manhattan office building is home to the world's largest chess board.

Read a book next to a Midtown waterfall.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

An unreal vintage shop that wears its dadaist influence on its zombie fish.

The Avenue of Mausolea is a series of grand palatial tombs.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Caves full of Buddhist statues, incredible rock formations and a deserted lagoon.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

The famous author's cottage hideaway.

A legendary speakeasy bookstore returns from the brink.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

Reforestation in action is the main attraction in this abandoned quarry.

A working monastery hidden away in Brooklyn once abutted the location of a former inebriate's home.

This historic black and white monastery is one of Bulgaria's architectural jewels.

A small sculpture garden that provides a microcosmic representation of California.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

This beautiful system of tunnels built into natural rock serves as a centuries old plumbing system.