If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

Iceland's tribute to its thankless civil servants.

An encyclopedic collection of mammal penises.

This hidden green space is the city's second largest conservatory.

What looks like a normal building is really a hollow facade hiding a subway vent.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This Parisian gem is one of the most incredible ethnographic museums in the world.

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

A glamorous hotel that once accommodated French resistance fighters and concentration camp survivors.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The narrowest street in Paris.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

These gardens recreate unique and endangered Michigan habitats.

This protected area in Lake Huron contains some of the world’s best-preserved shipwrecks.

A statue of the owner stands outside of this museum, once the most popular brothel in town.

"Enter and be entertained or annoyed by Dada in Walla Walla."

The 30,000-volume library is one of the world's most impressive poetry collections.

All of Chicago's wood-paved streets are long gone but two alleys remain.

Internationally known record store and purveyor of "dusties."

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

Seattle's super-sized cowboy apparel once belonged to a themed gas station that wrangled in herds of tourists.

An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.