Remains of the walls of the Roman city named for its founder

This amazing cathedral was built on the site of the first Marian shrine in Spain and is important to Spanish speakers the world over

The most amazing structure built for the 2008 Expo

This much reformed Modernist building will be of interest to fans of contemporary architecture too.

The world's largest sundial can cast a shadow more than 1,600 feet long.

This fantastical faceless sculpture in Spain is on the grandest scale.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.

One of the few surviving examples of Victorian-era public toilets now houses a small homestay.

Huge winged monument in the United Kingdom.

Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This lucky bronze frog was gifted to Madrid by a casino.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

An ancient Egyptian temple in the middle of Madrid, Spain.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

One of Madrid's most beloved statues is of an anonymous citizen.

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

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

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

Balconies that have a most unusual accent.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

The large collection of pre-Columbian pottery might make you blush.