The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

A lasting remnant of The Blitz.

A faded reminder of what was once a common sight in London during the Blitz.

A mysterious artist-run cabinet of curiosities and library.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Nature puts on a spectacular show at this blowhole on the eastern side of Gran Canaria.

Hundreds of caves once used to store grains and animal feed.

Tour the inside of a massive lava tube formed during a 1949 volcanic eruption.

The largest salt farm in the Canary Islands is located at the foot of an active volcano.

You can soak in three relaxing pools filled daily by the tide.

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

Portugal's National Pantheon has a history of curses, collapses and financial problems.

In the Monastery of São Vicente resides a gallery devoted to a breathtaking collection of seashells.

The best place in the world to buy tinned fish.

The history of drinking is told through 1,800 cups, chalices, and glasses at this exhibit.

The stunning interior of this Gothic church is covered in ornate gold details.

Ancient catacombs form the foundation for this Rococo orgy of a church.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A small but charming botanical garden that contains many exotic plant species.

Perhaps the most spectacular grotto along the Algarve coastline.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.