Sleep in a climate-controlled plastic bubble for the night.

Unusual British home built to disguise a water tower.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

This surreal art house looks like a geometric version of a small chapel.

One man's stunning attempt at eco-friendly living.

France's high-tech, future-themed amusement park.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Since ancient times these picturesque springs have been providing bathers with healing waters.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

Avant garde house of Pierre Cardin on the Cote d’Azur.

The largest underground church in Europe.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Amsterdam's former hotspot for public executions and dissections.

A floating cat sanctuary on an Amsterdam canal.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

This extremely narrow tenement boasts a maximum occupancy of just two.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

Museum preserving torture methods from the past.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A floating underwater hotel, created by a Swedish artist.

An idyllic hotel that gave its name to a supposed shadow government.

Colorful and chaotic stacked hotel in North Holland.

Survival capsules find a second life as a unique hotel.

Live out your childhood construction fantasies in this one-of-a-kind gyrating hotel.