This elderly couple's hand-picked collection of rare gems is one of the finest in all of Iceland.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

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

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

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

This fantastical waterfall is hidden in a cave located in a cracked cliff.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

There has been an astronomical clock on this spot since the 14th century.

The former locus of Boston's high culture has been shuttered and buried for over 70 years.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

A tiny monument to the classic American candy.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

This Massachusetts home was the first to have a telephone line and its own phone number: 1.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

This unassuming stone commemorates a condiment factory gone up in smoke.

A unique columnar residence built in the 19th century.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

Week-long block party becomes a competition for the best decorated street.

A lush indoor jungle fills this bustling Madrid transportation hub.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

A once-secret library of Freemason history in Catalonia.

For one day every month Barcelona's Estació de França transforms into a market for model trains.