This clifftop arch is a natural stunner.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

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

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

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

This medieval city gate is now a blend of the past and the modern world.

This building has two facades of clashing architectural designs.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

This beautifully restored fortification kept the city safe for centuries.

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

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

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

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

Singapore's oldest Hindu temple.

A graveyard that dates back over 200 years stands near a busy shopping center.

A public art jibe at one of the United States’ oldest and longest-serving senators.

Also known as the Founding Church of Scientology.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

The span is crooked and made from two older recycled bridges.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

Some of the greatest minds in the history of Hungarian art and science converged in this café.