A centuries-old copper mine that once provided two thirds of the world's copper supply.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

This 13th century Gothic brick castle is the largest in the world by surface area.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This public elevator links the lower city to the upper city of Salvador.

The reconstruction of this prominent building fulfilled a long-written command.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

The unusual patterns in this rock formation result from two distinct modes of weathering.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

This enormous monument is one of the most iconic structures in Tokyo, rudely nicknamed "The Golden Turd."

A remarkably opulent mansion with a tragic history.

The oldest continuously occupied public building in the United States.

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

The ominously named cave is home to some remarkable ancient art.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.