This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

A retired subway car stands alone in a field in the middle of Queens.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.

The world's only pure blue lizard lives exclusively on this secluded tropical island.

This semi-hidden Manhattan restaurant is based out of a loading dock.

The former Naval shipyard is open for exploring - mostly.

This charming woodland trail is peppered with poetry.

This solo operation offers the world's only whey wines in flavors such as chocolate-orange.

Found: Garden of Eden in Miami-Dade County, Florida.

This expansive bridge in the Canadian wilderness was originally just built for friends.

The home of aviation trailblazers, in a remote corner of the big city.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

The first green space constructed on an elevated viaduct.

At this sweet shop, the descendants of a royal chef serve up the fudge-like dessert his ancestor invented for a king.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

A little piece of the Shire is hidden behind a plant nursery in Port Orchard, Washington.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

A whimsical village of unique treehouses resides in a Washington forest.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

This spectacular track has run continuously since 1882.

Taos Pueblo recipes, foraged ingredients, and outdoor ovens define the menu at this eatery.