This magnificent Crimean estate was once a playground of the Russian elite.

The longest trolleybus route in the world, from Simferopol and Yalta.

The deepest metro station in the world.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

340-foot statue built to honour the Heroes of the Soviet Union.

The largest catacomb system in the world.

A castle perched precariously over the Crimean Sea.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

Visit this odd display of indigenous style in Argentine wine country.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Bible stories are brought to life with gloriously cartoonish kitsch in this South American theme park.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.

Quito's historic, main square dates back to the 16th century.

An art museum with an eclectic design and a scandalous past.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

This tin chapel was built by POW's during World War II and is painted to look like something much more grand.

This early version of the guillotine was used to execute the man responsible for its construction.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

Enter the world under the hill at this ancient UK burial chamber.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

The final resting place of soldiers' loyal canine companions.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

Possibly the oldest of Britain's ancient henges is also one of its most stark.