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

A museum dedicated to the alleged Roswell Incident.

A blacklight journey through a celestial art exhibit.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A young botanist's horticultural vision realized through a lifetime of planting, tending, and collecting seeds.

Granting the right of way to ships over surface traffic since 1917.

The second tallest railway trestle bridge in America.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

Two stone columns flank the grand Venice square, but there were supposed to be three.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

Go inside to really appreciate this 500-year-old technological masterpiece.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A sculpture serving as an homage to Pope John Paul II.

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Ancient ruins hidden underneath a modern luxury hotel.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.