Olfactory delights in San Francisco's Botanical Gardens.

A theme park made of glass, from the gleaming books on the shelves to the crystal fish in the mirror lake.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

What happens when you cross a mayor and a painter?

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

A 220-foot deep watery drop-off, filled with marine life.

A salt lake dotted with steaming limestone chimneys.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

Spring that emits water and fire at the same time is said to have remedial properties, and sparked its own religion.

The quintessential Japanese rock garden has existed for more than 500 years.

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

A massive work of modern art that appears to be a crop circle in the middle of the desert.

Norway's chilly all ice-instrument festival.

A memorial to the victims of Argentina's "Dirty War."

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

One woman's decades-long obsession with the "La Fée Verte."

An extravagant monument to an extravagantly unpopular Emperor.

A city entirely devoted to illegal gun production.

Leveled by an earthquake, this Italian village is now preserved as a massive concrete art project.

Dr Barnes' $25 billion private collection of art and arboretum.

The monster at the center of the Darwin Center Spirit Collection.

Seaside ruins of a settlement that date back to the first century B.C.